• Redis集群搭建

    Redis集群搭建

    1、主从模式部署

    1.1 环境准备

    IP主机名角色
    192.168.54.200mastermaster
    192.168.54.201slave1slave1
    192.168.54.202slave2slave2

    1.2 下载

    下载地址：http://download.redis.io/releases/

    这里选择下载：redis-7.0.3.tar.gz

    1.3 上传到服务器并且解压(所有节点)

    # 解压
tar -xf redis-7.0.3.tar.gz
cd redis-7.0.3
# 设置环境变量
echo "export REDIS_HOME=/home/zhangshixing/redis/redis-7.0.3">> /etc/profile
source /etc/profile

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    1.4 编译安装(所有节点)

    cd $REDIS_HOME
yum -y install gcc gcc++
make && make install
# 默认安装目录 /usr/local/bin

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    1.5 配置成服务(所有节点)

    cat << EOF > /usr/lib/systemd/system/redis.service
[Unit]
Description=Redis persistent key-value database
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/usr/local/bin/redis-server /usr/local/redis/redis.conf --supervised systemd
ExecStop=/usr/libexec/redis-shutdown
Type=forking
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755
LimitNOFILE=65536
PrivateTmp=true

[Install]
WantedBy=multi-user.target
EOF

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    配置描述：

    Description: # 描述服务 
After: # 描述服务类别 
[Service]: # 服务运行参数的设置 
Type=forking: # 是后台运行的形式 
ExecStart: # 为服务的具体运行命令 
ExecReload: # 为重启命令 
ExecStop: # 为停止命令 
LimitNOFILE=65536: # 打开文件数和进程数有限制,默认限制为1024,如果不设置,或者设置为LimitNOFILE=unlimited(不识别),则得到了1024
PrivateTmp=True: # 表示给服务分配独立的临时空间
#【注意】[Service]的启动、重启、停止命令全部要求使用绝对路径 
[Install]: # 运行级别下服务安装的相关设置,可设置为多用户,即系统运行级别为3

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    # 重载系统服务
systemctl daemon-reload

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    /usr/libexec/redis-shutdown的内容：

    #!/bin/bash
#
# Wrapper to close properly redis and sentinel
test x"$REDIS_DEBUG" != x && set -x

REDIS_CLI=/usr/local/bin/redis-cli

# Retrieve service name
SERVICE_NAME="$1"
if [ -z "$SERVICE_NAME" ]; then
   SERVICE_NAME=redis
fi

# Get the proper config file based on service name
CONFIG_FILE="/usr/local/redis/$SERVICE_NAME.conf"

# Use awk to retrieve host, port from config file
HOST=`awk '/^[[:blank:]]*bind/ { print $2 }' $CONFIG_FILE | tail -n1`
PORT=`awk '/^[[:blank:]]*port/ { print $2 }' $CONFIG_FILE | tail -n1`
PASS=`awk '/^[[:blank:]]*requirepass/ { print $2 }' $CONFIG_FILE | tail -n1`
SOCK=`awk '/^[[:blank:]]*unixsocket\s/ { print $2 }' $CONFIG_FILE | tail -n1`

# Just in case, use default host, port
HOST=${HOST:-127.0.0.1}
if [ "$SERVICE_NAME" = redis ]; then
    PORT=${PORT:-6379}
else
    PORT=${PORT:-26739}
fi

# Setup additional parameters
# e.g password-protected redis instances
[ -z "$PASS"  ] || ADDITIONAL_PARAMS="-a $PASS"

# shutdown the service properly
if [ -e "$SOCK" ] ; then
        $REDIS_CLI -s $SOCK $ADDITIONAL_PARAMS shutdown
else
        $REDIS_CLI -h $HOST -p $PORT $ADDITIONAL_PARAMS shutdown
fi

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    配置完就可以通过systemctl启停redis了。

    1.6 授权启动服务(所有节点)

    chmod +x /usr/libexec/redis-shutdown

useradd -s /sbin/nologin redis

mkdir /usr/local/redis ; cp $REDIS_HOME/redis.conf /usr/local/redis/ && chown -R redis:redis /usr/local/redis

mkdir -p /opt/software/redis-7.0.3/data && chown -R redis:redis /opt/software/redis-7.0.3/data

# 命令补全
yum install -y bash-completion && source /etc/profile                 

systemctl daemon-reload

systemctl enable redis

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    1.7 修改linux内核参数(所有节点)

    # 临时生效
sysctl  -w  vm.overcommit_memory=1
# 永久生效
echo 'vm.overcommit_memory=1' >> /etc/sysctl.conf && sysctl -p
# 可选值：0,1,2。
# 0: 表示内核将检查是否有足够的可用内存供应用进程使用;如果有足够的可用内存,内存申请允许;否则,内存申请失败,并把错误返回给应用进程。
# 1: 表示内核允许分配所有的物理内存,而不管当前的内存状态如何。
# 2: 表示内核允许分配超过所有物理内存和交换空间总和的内存。

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    1.8 配置(redis.conf)

    1.8.1 master节点配置

    修改配置如下：

    vi /usr/local/redis/redis.conf

    bind 192.168.54.200               # 监听ip,多个ip用空格分隔
daemonize yes               # 允许后台启动
logfile "/usr/local/redis/redis.log"                # 日志路径
dir /opt/software/redis-7.0.3/data                 # 数据库备份文件存放目录
masterauth 123456               # slave连接master密码,master可省略
requirepass 123456              # 设置master连接密码,slave可省略
appendonly yes                  # 在/opt/software/redis-7.0.3/data目录生成appendonly.aof文件，将每一次写操作请求都追加到appendonly.aof 文件中

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    1.8.2 slave1节点配置

    修改配置如下：

    vi /usr/local/redis/redis.conf

    bind 192.168.182.201               # 监听ip,多个ip用空格分隔
daemonize yes               # 允许后台启动
logfile "/usr/local/redis/redis.log"                # 日志路径
dir /opt/software/redis-7.0.3/data                 # 数据库备份文件存放目录
#  replicaof用于追随某个节点的redis,被追随的节点为主节点,追随的为从节点,就是设置master节点
replicaof 192.168.182.200 6379
masterauth 123456               # slave连接master密码，master可省略
requirepass 123456              # 设置master连接密码，slave可省略
appendonly yes                  # 在/opt/software/redis-7.0.3/data目录生成appendonly.aof文件，将每一次写操作请求都追加到appendonly.aof 文件中

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    1.8.3 slave2节点配置

    修改配置如下：

    vi /usr/local/redis/redis.conf

    bind 192.168.182.202               # 监听ip，多个ip用空格分隔
daemonize yes               # 允许后台启动
logfile "/usr/local/redis/redis.log"                # 日志路径
dir /opt/software/redis-7.0.3/data                 # 数据库备份文件存放目录
#  replicaof用于追随某个节点的redis,被追随的节点为主节点,追随的为从节点,就是设置master节点
replicaof 192.168.182.200 6379
masterauth 123456               # slave连接master密码，master可省略
requirepass 123456              # 设置master连接密码，slave可省略
appendonly yes                  # 在/opt/software/redis-7.0.3/data目录生成appendonly.aof文件，将每一次写操作请求都追加到appendonly.aof 文件中

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    1.9 启动Redis服务(所有节点)

    systemctl start redis
systemctl status redis

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    1.10 查看集群状态

    # 交互式
[root@master redis]# redis-cli -h 192.168.54.200 -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.54.200:6379> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.54.201,port=6379,state=online,offset=1204,lag=0
slave1:ip=192.168.54.202,port=6379,state=online,offset=1204,lag=1
master_failover_state:no-failover
master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1204
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1204

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    # 非交互式
[root@master redis]# redis-cli -h 192.168.54.200 -a 123456 info replication
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.54.201,port=6379,state=online,offset=1288,lag=1
slave1:ip=192.168.54.202,port=6379,state=online,offset=1288,lag=1
master_failover_state:no-failover
master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1288
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1288

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    # 交互式
[root@master redis]# redis-cli -h 192.168.54.200 -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.54.200:6379> auth 123456
OK
192.168.54.200:6379> info replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.54.201,port=6379,state=online,offset=1372,lag=1
slave1:ip=192.168.54.202,port=6379,state=online,offset=1372,lag=1
master_failover_state:no-failover
master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1372
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1372

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    在这里Redis的主从模式就部署完了（一主两从）。

    2、Sentinel(哨兵)模式部署

    2.1 环境准备

    IP主机名角色
    192.168.54.200mastermaster,Sentinel
    192.168.54.201slave1slave1,Sentinel
    192.168.54.202slave2slave2,Sentinel

    【温馨提示】 sentinel 最好跟redis部署在不同的机器上，sentinel 端口：26379。

    2.2 配置sentinel(所有节点)

    【温馨提示】前面已经安装过了redis主从模式了，因为哨兵模式是基于主从模式的，所以redis的配置这里就省略

    了，直接修改sentinel配置文件，配置3个哨兵，每个哨兵的配置都是一样的。

    # 三个节点创建存储目录
mkdir /opt/software/redis-7.0.3/sentinel; chown -R redis:redis /opt/software/redis-7.0.3/sentinel

cat >/usr/local/redis/sentinel.conf<<EOF
daemonize yes
logfile "/usr/local/redis/sentinel.log"
# sentinel工作目录
dir "/opt/software/redis-7.0.3/sentinel"
# 判断master失效至少需要2个sentinel同意，建议设置为n/2+1,n为sentinel个数
# sentinel monitor    
sentinel monitor mymaster 192.168.54.200 6379 2
sentinel auth-pass mymaster 123456
# 判断master主观下线时间，默认30s
sentinel down-after-milliseconds mymaster 30000
EOF

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    2.3 启动sentinel(所有节点)

    nohup /usr/local/bin/redis-sentinel /usr/local/redis/sentinel.conf >> nohup.out 2>&1 &
netstat -tnlp|grep 26379

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    2.4 模拟故障测试

    # 停掉master
systemctl stop redis
redis-cli -h 192.168.54.201 -a 123456 info replication

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    [root@master redis]# redis-cli -h 192.168.54.201 -a 123456 info replication
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# Replication
role:slave
master_host:192.168.54.200
master_port:6379
master_link_status:down
master_last_io_seconds_ago:-1
master_sync_in_progress:0
slave_read_repl_offset:20712
slave_repl_offset:20712
master_link_down_since_seconds:18
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:e85f46b61089c38974769a2faa2fb905d4efc66f
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:20712
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:20712

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    [root@master redis]# redis-cli -h 192.168.54.201 -a 123456 info replication
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# Replication
role:slave
master_host:192.168.54.202
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_read_repl_offset:29371
slave_repl_offset:29371
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:7a7fe0a8528e0c7913d5d54bc5ba633ab6879a8c
master_replid2:e85f46b61089c38974769a2faa2fb905d4efc66f
master_repl_offset:29371
second_repl_offset:20713
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:29371

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    发现master节点已经切换到其它节点了，再测试一下读写：

    [root@master redis]# redis-cli -h 192.168.54.202 -a 123456
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
192.168.54.202:6379> set k2 v2
OK

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    新的master节点写能力也正常，接下来就是恢复故障了。

    # 启动master
systemctl start redis
redis-cli -h 192.168.54.202 -a 123456 info replication

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    [root@master redis]# redis-cli -h 192.168.54.202 -a 123456 info replication
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.54.201,port=6379,state=online,offset=70444,lag=0
slave1:ip=192.168.54.200,port=6379,state=online,offset=70444,lag=0
master_failover_state:no-failover
master_replid:7a7fe0a8528e0c7913d5d54bc5ba633ab6879a8c
master_replid2:e85f46b61089c38974769a2faa2fb905d4efc66f
master_repl_offset:70587
second_repl_offset:20713
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:869
repl_backlog_histlen:69719

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    发现就算原先的master节点恢复了，也不会切换到master角色，而是作为slave角色。

    3、Cluster模式部署

    使用集群，只需要将redis配置文件中的cluster-enable配置打开即可。

    3.1 环境准备

    IP端口节点
    192.168.54.2007001,7002,7003node1
    192.168.54.2017001,7002,7003node2
    192.168.54.2027001,7002,7003node3

    3.2 修改配置(所有节点)

    【温馨提示】这里是基于主从模式的配置修改，不是基于主从模式部署，哨兵模式是基于主从模式部署。

    # 创建存储目录
mkdir -p /opt/software/redis-7.0.3/cluster/redis_{7001..7003}
cp /usr/local/redis/redis.conf /usr/local/redis/cluster_redis_7001.conf
cp /usr/local/redis/redis.conf /usr/local/redis/cluster_redis_7002.conf
cp /usr/local/redis/redis.conf /usr/local/redis/cluster_redis_7003.conf

chown -R redis:redis /usr/local/redis ;chown -R redis:redis /opt/software/redis-7.0.3/cluster

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    修改配置文件/usr/local/redis/cluster_redis_7001.conf

    # 【注意】节点不一样，IP不一样，记得修改这个bind配置
bind 192.168.54.200
port 7001
daemonize yes
pidfile "/var/run/cluster_redis_7001.pid"
logfile "/usr/local/redis/cluster_redis_7001.log"
dir "/opt/software/redis-7.0.3/cluster/redis_7001"
masterauth "123456"
requirepass "123456"
# replicaof 192.168.54.202 6379
appendonly yes
# 开启集群模式
cluster-enabled yes
# 虽然此配置的名字叫"集群配置文件"，但是此配置文件不能人工编辑，它是集群节点自动维护的文件，主要用于记录集群中有哪些节点、他们的状态以及一些持久化参数等，方便在重启时恢复这些状态。通常是在收到请求之后这个文件就会被更新。
cluster-config-file nodes_7001.conf
cluster-node-timeout 15000

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    修改配置文件/usr/local/redis/cluster_redis_7002.conf

    # 【注意】节点不一样，IP不一样，记得修改这个bind配置
bind 192.168.54.200
port 7002
daemonize yes
pidfile "/var/run/cluster_redis_7002.pid"
logfile "/usr/local/redis/cluster_redis_7002.log"
dir "/opt/software/redis-7.0.3/cluster/redis_7002"
masterauth "123456"
requirepass "123456"
# replicaof 192.168.54.202 6379
appendonly yes
# 配置yes则开启集群功能，此redis实例作为集群的一个节点，否则，它是一个普通的单一的redis实例。
cluster-enabled yes
# 虽然此配置的名字叫"集群配置文件"，但是此配置文件不能人工编辑，它是集群节点自动维护的文件，主要用于记录集群中有哪些节点、他们的状态以及一些持久化参数等，方便在重启时恢复这些状态。通常是在收到请求之后这个文件就会被更新。
cluster-config-file nodes_7002.conf
cluster-node-timeout 15000

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    修改配置文件/usr/local/redis/cluster_redis_7002.conf

    # 【注意】节点不一样，IP不一样，记得修改这个bind配置
bind 192.168.54.200
port 7003
daemonize yes
pidfile "/var/run/cluster_redis_7003.pid"
logfile "/usr/local/redis/cluster_redis_7003.log"
dir "/opt/software/redis-7.0.3/cluster/redis_7003"
masterauth "123456"
requirepass "123456"
# replicaof 192.168.54.202 6379
appendonly yes
# 配置yes则开启集群功能，此redis实例作为集群的一个节点，否则，它是一个普通的单一的redis实例。
cluster-enabled yes
# 虽然此配置的名字叫"集群配置文件"，但是此配置文件不能人工编辑，它是集群节点自动维护的文件，主要用于记录集群中有哪些节点、他们的状态以及一些持久化参数等，方便在重启时恢复这些状态。通常是在收到请求之后这个文件就会被更新。
cluster-config-file nodes_7003.conf
cluster-node-timeout 15000

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    其它两台机器配置与192.168.54.2000一致，只是ip不同，此处省略。

    # 将配置copy到另外两个节点
scp -r /usr/local/redis/cluster_redis_{7001..7003}.conf 192.168.54.201:/usr/local/redis/
scp -r /usr/local/redis/cluster_redis_{7001..7003}.conf 192.168.54.202:/usr/local/redis/

# 在node2上执行
sed -i 's/192.168.54.200/192.168.54.201/g' /usr/local/redis/cluster_redis_{7001..7003}.conf

# 在node3上执行
sed -i 's/192.168.54.200/192.168.54.202/g' /usr/local/redis/cluster_redis_{7001..7003}.conf

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    3.3 启动Redis服务(所有节点)

    nohup redis-server /usr/local/redis/cluster_redis_7001.conf >> nohup.out 2>&1 &
netstat -tnlp|grep 7001
nohup redis-server /usr/local/redis/cluster_redis_7002.conf >> nohup.out 2>&1 &
netstat -tnlp|grep 7002
nohup redis-server /usr/local/redis/cluster_redis_7003.conf >> nohup.out 2>&1 &
netstat -tnlp|grep 7003
tail -f /usr/local/redis/cluster_redis_7001.log
tail -f /usr/local/redis/cluster_redis_7002.log
tail -f /usr/local/redis/cluster_redis_7003.log

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    3.4 创建集群

    # --cluster-replicas 2 : 表示集群的一个主节点有2个从节点，就是一主两从模式
# 如果不加--cluster-replicas 2则会创建9个主节点
# --cluster / -c 告知redis-cli命令行工具，后续操作为cluster模式下
# --create 表示创建cluster模式
redis-cli -a 123456 --cluster create \
192.168.54.200:7001 192.168.54.200:7002 192.168.54.200:7003 \
192.168.54.201:7001 192.168.54.201:7002 192.168.54.201:7003 \
192.168.54.202:7001 192.168.54.202:7002 192.168.54.202:7003 \
--cluster-replicas 2

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    [root@master redis]# redis-cli -a 123456 --cluster create \
> 192.168.54.200:7001 192.168.54.200:7002 192.168.54.200:7003 \
> 192.168.54.201:7001 192.168.54.201:7002 192.168.54.201:7003 \
> 192.168.54.202:7001 192.168.54.202:7002 192.168.54.202:7003 \
> --cluster-replicas 2
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
>>> Performing hash slots allocation on 9 nodes...
Master[0] -> Slots 0 - 5460
Master[1] -> Slots 5461 - 10922
Master[2] -> Slots 10923 - 16383
Adding replica 192.168.54.201:7002 to 192.168.54.200:7001
Adding replica 192.168.54.202:7002 to 192.168.54.200:7001
Adding replica 192.168.54.200:7003 to 192.168.54.201:7001
Adding replica 192.168.54.202:7003 to 192.168.54.201:7001
Adding replica 192.168.54.201:7003 to 192.168.54.202:7001
Adding replica 192.168.54.200:7002 to 192.168.54.202:7001
M: d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001
   slots:[0-5460] (5461 slots) master
S: 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002
   replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e
S: 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003
   replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5
M: 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001
   slots:[5461-10922] (5462 slots) master
S: 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002
   replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42
S: 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003
   replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e
M: 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001
   slots:[10923-16383] (5461 slots) master
S: ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002
   replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42
S: bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003
   replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join
.
>>> Performing Cluster Check (using node 192.168.54.200:7001)
M: d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001
   slots:[0-5460] (5461 slots) master
   2 additional replica(s)
S: 18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002
   slots: (0 slots) slave
   replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42
S: 0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003
   slots: (0 slots) slave
   replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5
S: bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003
   slots: (0 slots) slave
   replicates 358f827f29b05016fb1f57c88cbdeb7dbfc613f5
M: 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001
   slots:[5461-10922] (5462 slots) master
   2 additional replica(s)
M: 41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001
   slots:[10923-16383] (5461 slots) master
   2 additional replica(s)
S: 9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003
   slots: (0 slots) slave
   replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e
S: 6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002
   slots: (0 slots) slave
   replicates 41d651cdefd81e8b2249cf9a99d151920a2e793e
S: ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002
   slots: (0 slots) slave
   replicates d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.

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    会自动生成nodes.conf文件

    [root@master redis]# ll /opt/software/redis-7.0.3/cluster/redis_{7001..7003}
/opt/software/redis-7.0.3/cluster/redis_7001:
总用量 4
drwxr-xr-x. 2 root root  103 12月 20 16:48 appendonlydir
-rw-r--r--. 1 root root 1237 12月 20 16:49 nodes_7001.conf

/opt/software/redis-7.0.3/cluster/redis_7002:
总用量 8
drwxr-xr-x. 2 root root  103 12月 20 16:49 appendonlydir
-rw-r--r--. 1 root root  171 12月 20 16:49 dump.rdb
-rw-r--r--. 1 root root 1237 12月 20 16:49 nodes_7002.conf

/opt/software/redis-7.0.3/cluster/redis_7003:
总用量 8
drwxr-xr-x. 2 root root  103 12月 20 16:49 appendonlydir
-rw-r--r--. 1 root root  171 12月 20 16:49 dump.rdb
-rw-r--r--. 1 root root 1237 12月 20 16:49 nodes.conf

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    3.5 集群操作

    3.5.1 登录集群
    redis-cli -c -h 192.168.54.200 -p 7001

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    3.5.2 查看集群信息
    > auth 123456
> CLUSTER INFO

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    3.5.3 列出节点信息
    > CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001
192.168.54.200:7001> auth 123456
OK
192.168.54.200:7001> CLUSTER INFO
cluster_state:ok
cluster_slots_assigned:16384
cluster_slots_ok:16384
cluster_slots_pfail:0
cluster_slots_fail:0
cluster_known_nodes:9
cluster_size:3
cluster_current_epoch:9
cluster_my_epoch:1
cluster_stats_messages_ping_sent:233
cluster_stats_messages_pong_sent:247
cluster_stats_messages_sent:480
cluster_stats_messages_ping_received:239
cluster_stats_messages_pong_received:233
cluster_stats_messages_meet_received:8
cluster_stats_messages_received:480
total_cluster_links_buffer_limit_exceeded:0
192.168.54.200:7001> CLUSTER NODES
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671526417098 1 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671526415000 1 connected 0-5460
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671526419115 4 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671526418107 4 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671526417000 4 connected 5461-10922
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671526418000 7 connected 10923-16383
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671526419000 7 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671526418000 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671526416000 1 connected
192.168.54.200:7001>

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    3.5.4 增加节点

    node1上增加一节点

    【1】配置
    # copy配置
cp /usr/local/redis/cluster_redis_7003.conf /usr/local/redis/cluster_redis_7004.conf
# 创建存储目录
mkdir /opt/software/redis-7.0.3/cluster/redis_7004

# 修改配置
vi /usr/local/redis/cluster_redis_7004.conf

bind 192.168.54.200
port 7004
daemonize yes
pidfile "/var/run/redis_7004.pid"
logfile "/usr/local/redis/cluster_redis_7004.log"
dir "/opt/software/redis-7.0.3/cluster/redis_7004"
#replicaof 192.168.182.110 6379
masterauth "123456"
requirepass "123456"
appendonly yes
cluster-enabled yes
cluster-config-file nodes_7004.conf
cluster-node-timeout 15000

# 授权
chown -R redis:redis /usr/local/redis && chown -R redis:redis /opt/software/redis-7.0.3/cluster/redis_7004

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    【2】启动服务
    nohup redis-server /usr/local/redis/cluster_redis_7004.conf >> nohup.out 2>&1 &
netstat -tnlp|grep 7004

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    【3】集群中增加节点
    [root@local-168-182-110 ~]# redis-cli -c -h 192.168.54.200 -p 7001
> auth 123456
# 添加节点
> CLUSTER MEET 192.168.54.200 7004
# 查看节点信息
> CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001
192.168.54.200:7001> auth 123456
OK
192.168.54.200:7001> CLUSTER MEET 192.168.54.200 7004
OK
192.168.54.200:7001> CLUSTER NODES
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 master - 0 1671527132044 0 connected
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527134063 1 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527131000 1 connected 0-5460
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527132000 4 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527132000 4 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527133000 4 connected 5461-10922
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527133567 7 connected 10923-16383
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527132000 7 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527133051 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527131000 1 connected

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    可以看到，新增的节点都是以master身份加入集群的

    【4】更换节点身份

    将新增的192.168.54.200:7004节点身份改为192.168.54.200:7001的slave：

    redis-cli -c -h 192.168.54.200 -p 7004
> auth 123456
# 改变节点类型
> cluster replicate d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42
> CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.200 -p 7004
192.168.54.200:7004> auth 123456
OK
192.168.54.200:7004> CLUSTER NODES
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527454000 1 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527451000 7 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527452371 4 connected 5461-10922
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 master - 0 1671527455399 1 connected 0-5460
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527454000 7 connected
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527453000 7 connected 10923-16383
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527453883 4 connected
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 myself,master - 0 1671527448000 0 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527451000 4 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527455000 1 connected
192.168.54.200:7004> cluster replicate d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42
OK
192.168.54.200:7004> CLUSTER NODES
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527488000 1 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527490723 7 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527489000 4 connected 5461-10922
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 master - 0 1671527489713 1 connected 0-5460
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527486675 7 connected
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527489598 7 connected 10923-16383
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527487000 4 connected
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 myself,slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527486000 1 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527487683 4 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527488691 1 connected

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    3.5.5 删除节点
    redis-cli -c -h 192.168.54.200 -p 7001
> auth 123456
# 查看节点
> CLUSTER NODES
# 删除节点
> CLUSTER FORGET a9b489648b4acc38bfc04499767f808b7208cb1f
# 检查节点信息
> CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001
192.168.54.200:7001> auth 123456
OK
192.168.54.200:7001> CLUSTER NODES
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527601411 1 connected
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527598000 1 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527595000 1 connected 0-5460
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527600403 4 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527599000 4 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527599393 4 connected 5461-10922
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527598000 7 connected 10923-16383
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527597374 7 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527597000 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527600000 1 connected
192.168.54.200:7001> CLUSTER FORGET a9b489648b4acc38bfc04499767f808b7208cb1f
OK
192.168.54.200:7001>
192.168.54.200:7001> CLUSTER NODES
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527636743 1 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527636000 1 connected 0-5460
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527635733 4 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527637753 4 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527635000 4 connected 5461-10922
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527632000 7 connected 10923-16383
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527634724 7 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527635000 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527632206 1 connected

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    3.5.6 保存配置
    redis-cli -c -h 192.168.54.200 -p 7001
> auth 123456
# 将节点的配置文件保存到硬盘里面
> CLUSTER SAVECONFIG
> CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.200 -p 7001
192.168.54.200:7001> auth 123456
OK
192.168.54.200:7001> CLUSTER SAVECONFIG
OK
192.168.54.200:7001> CLUSTER NODES
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527763975 1 connected
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527763000 1 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 myself,master - 0 1671527762000 1 connected 0-5460
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527760000 4 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671527759929 4 connected
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 master - 0 1671527759000 4 connected 5461-10922
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671527761000 7 connected 10923-16383
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527762964 7 connected
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671527762000 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 0 1671527761956 1 connected

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    可以看到，之前删除的节点又恢复了，这是因为对应的配置文件没有删除，执行CLUSTER SAVECONFIG恢复。

    3.5.7 模拟master节点挂掉
    netstat -lntp |grep :7001|awk '{print $NF}'|cut -d '/' -f 1|xargs kill -9
redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528090000 7 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528090000 4 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 master,fail - 1671528024512 1671528017000 1 disconnected
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528094858 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528093000 10 connected
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528093843 10 connected
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671528091000 7 connected 10923-16383
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 myself,master - 0 1671528093000 4 connected 5461-10922
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528092000 4 connected
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 master - 0 1671528092000 10 connected 0-5460

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    对应192.168.54.200:7001的一行可以看到，master fail，状态为disconnected；而对应

    192.168.54.200:7004的一行，slave已经变成master。

    【故障恢复】重新启动192.168.54.200:7001节点

    nohup redis-server /usr/local/redis/cluster_redis_7001.conf >> nohup.out 2>&1 &
redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES

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    [root@master redis]# redis-cli -c -h 192.168.54.201 -p 7001 -a 123456 CLUSTER NODES
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
6999efc73a2d128d8583139074929fa144f43d78 192.168.54.200:7002@17002 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528205550 7 connected
bdadcef4ac56abebb545c0cb69c509f8a7491bef 192.168.54.202:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528206457 4 connected
d88cfb0ee3c53547ce7f1f237655fbd3cd6a7a42 192.168.54.200:7001@17001 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528206000 10 connected
9e95afd03e0b3e019ff81e5dcf78f962830bca69 192.168.54.201:7003@17003 slave 41d651cdefd81e8b2249cf9a99d151920a2e793e 0 1671528206000 7 connected
ee7300d10e1fd6f52b221b639367e9a6d55d85d5 192.168.54.202:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528208475 10 connected
18c654e7a1df333c456aa119a2cf36a0c8272165 192.168.54.201:7002@17002 slave a9b489648b4acc38bfc04499767f808b7208cb1f 0 1671528206000 10 connected
41d651cdefd81e8b2249cf9a99d151920a2e793e 192.168.54.202:7001@17001 master - 0 1671528206558 7 connected 10923-16383
358f827f29b05016fb1f57c88cbdeb7dbfc613f5 192.168.54.201:7001@17001 myself,master - 0 1671528205000 4 connected 5461-10922
0adc0cb28eb662df3f139ee4a6752d187297a443 192.168.54.200:7003@17003 slave 358f827f29b05016fb1f57c88cbdeb7dbfc613f5 0 1671528207466 4 connected
a9b489648b4acc38bfc04499767f808b7208cb1f 192.168.54.200:7004@17004 master - 0 1671528206000 10 connected 0-5460

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    可以看到，192.168.54.200:7001节点启动后为slave节点，并且是192.168.54.200:7004的slave节点。即

    master节点如果挂掉，它的slave节点变为新master节点继续对外提供服务，而原来的master节点如果重启，则

    变为新master节点的slave节点。

    【温馨提示】cluster不能选择db，只能默认db为0，所以select切库相当于是不能使用的。

    4、简单使用

    4.1 集群常用操作

    4.1.1 查看集群信息
    # 打印集群的信息
cluster info
# 列出集群当前已知的所有节点(node),以及这些节点的相关信息
cluster nodes

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    4.1.2 节点操作
    # 将ip和port所指定的节点添加到集群当中,让它成为集群的一份子
cluster meet <ip> <port>
# 从集群中移除node_id指定的节点
cluster forget <node_id>
# 将当前节点设置为node_id指定的节点的从节点
cluster replicate <node_id>
# 将节点的配置文件保存到硬盘里面
cluster saveconfig

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    4.1.3 槽(slot)
    # 将一个或多个槽(slot)指派(assign)给当前节点
cluster addslots <slot> [slot ...]
# 移除一个或多个槽对当前节点的指派
cluster delslots <slot> [slot ...]
# 移除指派给当前节点的所有槽,让当前节点变成一个没有指派任何槽的节点
cluster flushslots
# 将槽slot指派给node_id指定的节点,如果槽已经指派给另一个节点
# 那么先让另一个节点删除该槽,然后再进行指派
cluster setslot <slot> node <node_id>
# 将本节点的槽slot迁移到node_id指定的节点中
cluster setslot <slot> migrating <node_id>
# 从node_id指定的节点中导入槽slot到本节点
cluster setslot <slot> importing <node_id>
# 取消对槽slot的导入(import)或者迁移(migrate)
cluster setslot <slot> stable

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    4.1.4 键
    # 计算键key应该被放置在哪个槽上
cluster keyslot <key>
# 返回槽slot目前包含的键值对数量
cluster countkeysinslot <slot>
# 返回count个slot槽中的键
cluster getkeysinslot <slot> <count>

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    4.2 redis 常用操作

    4.2.1 字符串(String)
    # 登录master节点，slave节点是只读的
redis-cli -c -h 192.168.182.112 -p 7001
192.168.182.112:7001> auth 123456
OK
192.168.182.112:7001> set k1 v1
OK
192.168.182.112:7001> get k1
"v1"
# 获取多个值
192.168.182.112:7001> mget k1 k2 k3
1) "v1"
2) "v2"
3) "v3"

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    4.2.2 哈希(Hash)

    Redis hash 是一个 string 类型的 field（字段） 和 value（值） 的映射表，hash 特别适合用于存储对象。

    # 登录master节点，slave节点是只读的
redis-cli -c -h 192.168.182.112 -p 7001
192.168.182.112:7001> auth 123456
# 设置
192.168.182.112:7001> HSET myhash field1 "foo"
(integer) 1
# 获取
192.168.182.112:7001> hget myhash field1
"foo"

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    4.2.3 列表(List)

    Redis列表是简单的字符串列表，按照插入顺序排序。你可以添加一个元素到列表的头部（左边）或者尾部（右

    边）。

    # 登录master节点,slave节点是只读的
redis-cli -c -h 192.168.182.112 -p 7001
192.168.182.112:7001> auth 123456
192.168.182.112:7001> LPUSH larr v1
(integer) 1
192.168.182.112:7001> LPUSH larr v2
(integer) 2
192.168.182.112:7001> LPUSH larr v3
(integer) 3
# 获取0到10个元素
192.168.182.112:7001> LRANGE larr  0 10
1) "v3"
2) "v2"
3) "v1"

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    4.2.4 集合(Set)

    Redis 的 Set 是 String 类型的无序集合。集合成员是唯一的，这就意味着集合中不能出现重复的数据。

    # 登录master节点,slave节点是只读的
redis-cli -c -h 192.168.182.112 -p 7001
192.168.182.112:7001> auth 123456
192.168.182.112:7001> SADD myset "hello"
(integer) 1
192.168.182.112:7001> SADD myset "foo"
(integer) 1
# 已经存在,则不能添加该元素
192.168.182.112:7001> SADD myset "hello"
(integer) 0
# 获取
192.168.182.112:7001> SMEMBERS myset
1) "foo"
2) "hello"
192.168.182.112:6379>

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    4.2.5 有序集合(sorted set)

    Redis 有序集合和集合一样也是 string 类型元素的集合，且不允许重复的成员。不同的是每个元素都会关联一个

    double 类型的分数。redis 正是通过分数来为集合中的成员进行从小到大的排序。有序集合的成员是唯一的，但

    分数(score)却可以重复。

    # 登录master节点,slave节点是只读的
redis-cli -c -h 192.168.182.112 -p 7001
192.168.182.112:7001> auth 123456
192.168.182.112:7001> ZADD key1 1 redis
(integer) 1
192.168.182.112:7001> ZADD key1 2 mongodb
(integer) 1
192.168.182.112:7001> ZADD key1 3 mysql
(integer) 1
# 已经存在,不能添加
192.168.182.112:7001> ZADD key1  3 mysql
(integer) 0
# 已经存在,不能添加
192.168.182.112:7001> ZADD key1  4 mysql
(integer) 0
# 获取数据
192.168.182.112:7001> ZRANGE key1  0 10 WITHSCORES
1) "redis"
2) "1"
3) "mongodb"
4) "2"
5) "mysql"
6) "4"

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    主从模式、哨兵模式、集群模式的环境部署就到这里了。

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  • 原文地址：https://blog.csdn.net/qq_30614345/article/details/132379058