• kubernetes——快速部署

    2. Kubernetes快速部署

    kubeadm是官方社区推出的一个用于快速部署kubernetes集群的工具。

    这个工具能通过两条指令完成一个kubernetes集群的部署：

    1. # 创建一个 Master 节点
    2. $ kubeadm init
    3.  
    4. # 将一个 Node 节点加入到当前集群中
    5. $ kubeadm join

     k8s部署方式：

    •         二进制部署
    •         kubeadm部署

    2.1 安装要求

    在开始之前，部署Kubernetes集群机器需要满足以下几个条件：

    -至少3台机器，操作系统 CentOS7+

    • 硬件配置：2GB或更多RAM，2个CPU或更多CPU，硬盘20GB或更多
    • 集群中所有机器之间网络互通
    • 可以访问外网，需要拉取镜像
    • 禁止swap分区

    2.2 学习目标

    1. 在所有节点上安装Docker和kubeadm
    2. 部署Kubernetes Master
    3. 部署容器网络插件
    4. 部署 Kubernetes Node，将节点加入Kubernetes集群中
    5. 部署Dashboard Web页面，可视化查看Kubernetes资源

    2.3  准备环境

    角色 IP
    master 192.168.2.129
    node1 192.168.2.128
    node2 192.168.2.131

     master

     node1，node2

     master

    1. //配置yum源
    2. //设置主机名：
    3. [root@localhost ~]# hostnamectl set-hostname k8s-master
    4. [root@localhost ~]# bash
    5.  
    6. //关闭防火墙：
    7. [root@k8s-master ~]# systemctl disable --now firewalld
    8. Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
    9. Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
    10. [root@k8s-master ~]# vi /etc/selinux/config 
    11.  
    12. //关闭swap：
    13. [root@k8s-master ~]# free -m
    14.               total        used        free      shared  buff/cache   available
    15. Mem:           3709         235        3251           8         222        3247
    16. Swap:          2047           0        2047
    17. [root@k8s-master ~]# vi /etc/fstab 
    18. #/dev/mapper/rhel-swap   none                    swap    defaults        0 0   
    19. //这一行注释掉，或者删掉，#代表注释
    20.  
    21. //在master添加hosts：
    22. [root@k8s-master ~]# cat >> /etc/hosts << EOF
    23. > 192.168.122.131 master master.example.com
    24. > 192.168.122.132 node1 node1.example.com
    25. > 192.168.122.133 node2 node2.example.com
    26. > EOF
    27. [root@k8s-master ~]# vi /etc/hosts
    28. [root@k8s-master ~]# cat /etc/hosts
    29. 127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    30. ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    31. 192.168.2.129 k8s-master 
    32. 192.168.2.128 k8s-node1
    33. 192.168.2.131 k8s-node2
    34.  
    35. //将桥接的IPv4流量传递到iptables的链：
    36. [root@k8s-master ~]# cat > /etc/sysctl.d/k8s.conf << EOF
    37. > net.bridge.bridge-nf-call-ip6tables = 1
    38. > net.bridge.bridge-nf-call-iptables = 1
    39. > EOF
    40. [root@k8s-master ~]# sysctl --system      //使其生效
    41. * Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ...
    42. kernel.yama.ptrace_scope = 0
    43. * Applying /usr/lib/sysctl.d/50-coredump.conf ...
    44. kernel.core_pattern = |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e
    45. kernel.core_pipe_limit = 16
    46. * Applying /usr/lib/sysctl.d/50-default.conf ...
    47. kernel.sysrq = 16
    48. kernel.core_uses_pid = 1
    49. kernel.kptr_restrict = 1
    50. net.ipv4.conf.all.rp_filter = 1
    51. net.ipv4.conf.all.accept_source_route = 0
    52. net.ipv4.conf.all.promote_secondaries = 1
    53. net.core.default_qdisc = fq_codel
    54. fs.protected_hardlinks = 1
    55. fs.protected_symlinks = 1
    56. * Applying /usr/lib/sysctl.d/50-libkcapi-optmem_max.conf ...
    57. net.core.optmem_max = 81920
    58. * Applying /usr/lib/sysctl.d/50-pid-max.conf ...
    59. kernel.pid_max = 4194304
    60. * Applying /etc/sysctl.d/99-sysctl.conf ...
    61. * Applying /etc/sysctl.d/k8s.conf ...
    62. * Applying /etc/sysctl.conf ...
    63. [root@k8s-master ~]# 
    64.  
    65. //安装chrony，时间同步：
    66. [root@k8s-master ~]# yum -y install chrony
    67. [root@k8s-master ~]# vi /etc/chrony.conf 
    68. # Use public servers from the pool.ntp.org project.
    69. # Please consider joining the pool (http://www.pool.ntp.org/join.html).
    70. pool time1.aliyun.com iburst     //这里修改成这样
    71. [root@k8s-master ~]# systemctl enable chronyd
    72. [root@k8s-master ~]# systemctl restart chronyd
    73. [root@k8s-master ~]# systemctl status chronyd
    74. ● chronyd.service - NTP client/server
    75.    Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor prese>
    76.    Active: active (running) since Tue 2022-09-06 19:24:19 CST; 10s ago
    77.      Docs: man:chronyd(8)
    78.            man:chrony.conf(5)
    79.   Process: 10368 ExecStartPost=/usr/libexec/chrony-helper update-daemon (code=exi>
    80.   Process: 10364 ExecStart=/usr/sbin/chronyd $OPTIONS (code=exited, status=0/SUCC>
    81.  Main PID: 10366 (chronyd)
    82.     Tasks: 1 (limit: 23502)
    83.    Memory: 928.0K
    84.    CGroup: /system.slice/chronyd.service
    85.            └─10366 /usr/sbin/chronyd
    86.  
    87. Sep 06 19:24:19 k8s-master systemd[1]: Starting NTP client/server...
    88. Sep 06 19:24:19 k8s-master chronyd[10366]: chronyd version 4.1 starting (+CMDMON >
    89. Sep 06 19:24:19 k8s-master chronyd[10366]: Using right/UTC timezone to obtain lea>
    90. Sep 06 19:24:19 k8s-master systemd[1]: Started NTP client/server.
    91. Sep 06 19:24:23 k8s-master chronyd[10366]: Selected source 203.107.6.88 (time1.al>
    92. Sep 06 19:24:23 k8s-master chronyd[10366]: System clock TAI offset set to 37 seco>
    93. [root@k8s-master ~]# 
    94.  
    95. //ping通
    96. [root@k8s-master ~]# ping k8s-master
    97. PING k8s-master (192.168.2.129) 56(84) bytes of data.
    98. 64 bytes from k8s-master (192.168.2.129): icmp_seq=1 ttl=64 time=0.022 ms
    99. 64 bytes from k8s-master (192.168.2.129): icmp_seq=2 ttl=64 time=0.025 ms
    100. 64 bytes from k8s-master (192.168.2.129): icmp_seq=3 ttl=64 time=0.026 ms
    101. ^C
    102. --- k8s-master ping statistics ---
    103. 3 packets transmitted, 3 received, 0% packet loss, time 2067ms
    104. rtt min/avg/max/mdev = 0.022/0.024/0.026/0.004 ms
    105. [root@k8s-master ~]# ping k8s-node1
    106. PING k8s-node1 (192.168.2.128) 56(84) bytes of data.
    107. 64 bytes from k8s-node1 (192.168.2.128): icmp_seq=1 ttl=64 time=0.513 ms
    108. ^C
    109. --- k8s-node1 ping statistics ---
    110. 1 packets transmitted, 1 received, 0% packet loss, time 0ms
    111. rtt min/avg/max/mdev = 0.513/0.513/0.513/0.000 ms
    112. [root@k8s-master ~]# ping k8s-node2
    113. PING k8s-node2 (192.168.2.131) 56(84) bytes of data.
    114. 64 bytes from k8s-node2 (192.168.2.131): icmp_seq=1 ttl=64 time=0.382 ms
    115. 64 bytes from k8s-node2 (192.168.2.131): icmp_seq=2 tt
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  • 原文地址：https://blog.csdn.net/qq_59324730/article/details/126730955