rke2安装单节点k8s

环境

1. cat /proc/version

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Linux version 3.10.0-957.21.3.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP Tue Jun 18 16:35:19 UTC 2019
root@10.101.1.30 ~$ cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)

1. cat /etc/redhat-release

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CentOS Linux release 7.5.1804 (Core)
安装

1. # 通过rke2安装k8s
2. curl -sfL https://get.rke2.io | sh -
4. # 开机启动rke2-server
5. systemctl enable rke2-server.service
7. # 启动rke2-server 启动有点慢,耐心等待即可
8. systemctl start rke2-server.service

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查看rke2-server状态

1. systemctl status rke2-server.service

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显示running表示启动成功,如下:
● rke2-server.service - Rancher Kubernetes Engine v2 (server)
Loaded: loaded (/usr/lib/systemd/system/rke2-server.service; disabled; vendor preset: disabled)
Active: active (running) since 三 2023-07-05 14:41:59 CST; 43s ago
检查 RKE2 是否正常运行

1. /var/lib/rancher/rke2/bin/kubectl \
2.         --kubeconfig /etc/rancher/rke2/rke2.yaml get nodes

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当输出以下结果, 状态为Ready时,表示k8s已经安装完毕
NAME    STATUS   ROLES                       AGE     VERSION
node2   Ready    control-plane,etcd,master   7m48s   v1.25.11+rke2r1
测试集群 Pod 的健康状况

1. /var/lib/rancher/rke2/bin/kubectl \
2.         --kubeconfig /etc/rancher/rke2/rke2.yaml get pods --all-namespaces

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拷贝脚本和k8s配置 (可选)

/etc/rancher/rke2/rke2.yaml 需要妥善保存,它包含了连接k8s的凭证.后续用kubectl操作k8s都要读取该文件

1. cp /var/lib/rancher/rke2/bin/kubectl /usr/local/bin/kubectl
2. cp /etc/rancher/rke2/rke2.yaml .kube/config
4. # 拷贝脚本和配置之后,以上命令可以简化为 .前提是/usr/local/bin/已经添加到了环境变量中
5. kubectl get nodes
6. kubectl get pods --all-namespaces

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完全卸载

1. [/code]rke2-uninstall.sh 内容如下
2. [code]#!/bin/sh
3. set -ex
5. # make sure we run as root
6. if [ ! $(id -u) -eq 0 ]; then
7.     echo "$(basename "${0}"): must be run as root" >&2
8.     exit 1
9. fi
11. # check_target_mountpoint return success if the target directory is on a dedicated mount point
12. check_target_mountpoint() {
13.     mountpoint -q "$1"
14. }
16. # check_target_ro returns success if the target directory is read-only
17. check_target_ro() {
18.     touch "$1"/.rke2-ro-test && rm -rf "$1"/.rke2-ro-test
19.     test $? -ne 0
20. }
22. . /etc/os-release
23. if [ -r /etc/redhat-release ] || [ -r /etc/centos-release ] || [ -r /etc/oracle-release ]; then
24.     # If redhat/oracle family os is detected, double check whether installation mode is yum or tar.
25.     # yum method assumes installation root under /usr
26.     # tar method assumes installation root under /usr/local
27.     if rpm -q rke2-common >/dev/null 2>&1; then
28.         : "${INSTALL_RKE2_ROOT:="/usr"}"
29.     else
30.         : "${INSTALL_RKE2_ROOT:="/usr/local"}"
31.     fi
32. elif [ "${ID_LIKE%%[ ]*}" = "suse" ]; then
33.     if rpm -q rke2-common >/dev/null 2>&1; then
34.         : "${INSTALL_RKE2_ROOT:="/usr"}"
35.         if [ -x /usr/sbin/transactional-update ]; then
36.             transactional_update="transactional-update -c --no-selfupdate -d run"
37.         fi
38.     elif check_target_mountpoint "/usr/local" || check_target_ro "/usr/local"; then
39.         # if /usr/local is mounted on a specific mount point or read-only then
40.         # install we assume that installation happened in /opt/rke2
41.         : "${INSTALL_RKE2_ROOT:="/opt/rke2"}"
42.     else
43.         : "${INSTALL_RKE2_ROOT:="/usr/local"}"
44.     fi
45. else
46.     : "${INSTALL_RKE2_ROOT:="/usr/local"}"
47. fi
49. uninstall_killall()
50. {
51.     _killall="$(dirname "$0")/rke2-killall.sh"
52.     if [ -e "${_killall}" ]; then
53.       eval "${_killall}"
54.     fi
55. }
57. uninstall_disable_services()
58. {
59.     if command -v systemctl >/dev/null 2>&1; then
60.         systemctl disable rke2-server || true
61.         systemctl disable rke2-agent || true
62.         systemctl reset-failed rke2-server || true
63.         systemctl reset-failed rke2-agent || true
64.         systemctl daemon-reload
65.     fi
66. }
68. uninstall_remove_files()
69. {   
70.    
71.     if [ -r /etc/redhat-release ] || [ -r /etc/centos-release ] || [ -r /etc/oracle-release ]; then
72.         yum remove -y "rke2-*"
74.         rm -f /etc/yum.repos.d/rancher-rke2*.repo
75.     fi
77.     if [ "${ID_LIKE%%[ ]*}" = "suse" ]; then
78.          if rpm -q rke2-common >/dev/null 2>&1; then
79.             # rke2 rpm detected
80.             uninstall_cmd="zypper remove -y rke2-server rke2-agent rke2-common rke2-selinux"
81.             if [ "${TRANSACTIONAL_UPDATE=false}" != "true" ] && [ -x /usr/sbin/transactional-update ]; then
82.                 uninstall_cmd="transactional-update -c --no-selfupdate -d run $uninstall_cmd"
83.             fi
84.             $uninstall_cmd
85.             rm -f /etc/zypp/repos.d/rancher-rke2*.repo
86.          fi
87.     fi
89.     $transactional_update find "${INSTALL_RKE2_ROOT}/lib/systemd/system" -name rke2-*.service -type f -delete
90.     $transactional_update find "${INSTALL_RKE2_ROOT}/lib/systemd/system" -name rke2-*.env -type f -delete
91.     find /etc/systemd/system -name rke2-*.service -type f -delete
92.     $transactional_update rm -f "${INSTALL_RKE2_ROOT}/bin/rke2"
93.     $transactional_update rm -f "${INSTALL_RKE2_ROOT}/bin/rke2-killall.sh"
94.     $transactional_update rm -rf "${INSTALL_RKE2_ROOT}/share/rke2"
95.     rm -rf /etc/rancher/rke2
96.     rm -rf /etc/rancher/node
97.     rm -d /etc/rancher || true
98.     rm -rf /etc/cni
99.     rm -rf /opt/cni/bin
100.     rm -rf /var/lib/kubelet
101.     rm -rf /var/lib/rancher/rke2
102.     rm -d /var/lib/rancher || true
104.     if type fapolicyd >/dev/null 2>&1; then
105.         if [ -f /etc/fapolicyd/rules.d/80-rke2.rules ]; then
106.             rm -f /etc/fapolicyd/rules.d/80-rke2.rules
107.         fi
108.         fagenrules --load
109.         systemctl restart fapolicyd
110.     fi
111. }
113. uninstall_remove_self()
114. {
115.     $transactional_update rm -f "${INSTALL_RKE2_ROOT}/bin/rke2-uninstall.sh"
116. }
118. uninstall_remove_policy()
119. {
120.     semodule -r rke2 || true
121. }
123. uninstall_killall
124. trap uninstall_remove_self EXIT
125. uninstall_disable_services
126. uninstall_remove_files
127. uninstall_remove_policy
128. sudo rm -rf ~/.kube/

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参考

为 Rancher 设置高可用的 RKE2 Kubernetes 集群

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