`etcd` 环境设置¶

我在 Kubespray快速起步成功部署了一个生产就绪的Kubernetes集群后，发现直接 Kubespray维护etcd 时由于环境变量配置问题无法直接访问和维护 etcd - 分布式kv存储。所以借助 Kubespray 部署的 Systemd进程管理器包装的容器运行时(Container Runtimes) 运行 etcd - 分布式kv存储，梳理维护方法。

在 /etc/etcd.env 配置了 Systemd进程管理器运行启动 etcd - 分布式kv存储的执行参数，也包括了 etcdctl 客户端运行参数:

正确的 采用 /etc/etcd.env 输出环境变量来使用 etcdctl¶

# CLI settings
ETCDCTL_ENDPOINTS=https://127.0.0.1:2379
ETCDCTL_CACERT=/etc/ssl/etcd/ssl/ca.pem
ETCDCTL_KEY=/etc/ssl/etcd/ssl/admin-y-k8s-m-1-key.pem
ETCDCTL_CERT=/etc/ssl/etcd/ssl/admin-y-k8s-m-1.pem

执行以下脚本命令为自己构建一个环境变量:

正确的 采用 /etc/etcd.env 输出环境变量来使用 etcdctl¶

# 从 /etc/etcd.env 中取出变量 ETCD_INITIAL_CLUSTER 并过滤出etcd的3个服务器IP地址
# 也就是将 ETCD_INITIAL_CLUSTER=etcd1=https://192.168.8.116:2380,etcd2=https://192.168.8.117:2380,etcd3=https://192.168.8.118:2380
# 转换成 192.168.8.116 192.168.8.117 192.168.8.118
# 可以使用 echo $ETCD_INITIAL_CLUSTER | awk -F'[= ,]' '{print $2, $4, $6}' | sed 's/https:\/\///g' | sed 's/:2380//g'

. /etc/etcd.env

echo ". /etc/etcd.env" >> ~/.bashrc

# 我发现还是通过sed转换更为简洁
var="ETCDCTL_ENDPOINTS=`echo $ETCD_INITIAL_CLUSTER | sed 's/etcd.=//g' | sed 's/:2380/:2379/g'`"
echo $var >> ~/.bashrc
 
echo "export ETCDCTL_ENDPOINTS ETCDCTL_CACERT ETCDCTL_KEY ETCDCTL_CERT" >> ~/.bashrc
echo "alias etcd_status='etcdctl --write-out=table endpoint status'" >> ~/.bashrc

此时执行 etcd_status 就能正确看到当前集群的etcd状态:

包装一个 etcd_status 命令查看etcd健康状态¶

+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|          ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://192.168.8.116:2379 | 3ff555f9837c69b9 |   3.5.6 |  7.8 MB |      true |      false |        16 |    2014832 |            2014832 |        |
| https://192.168.8.117:2379 | 4a784b4a93b49575 |   3.5.6 |  7.9 MB |     false |      false |        16 |    2014832 |            2014832 |        |
| https://192.168.8.118:2379 | cb79cdeb0f0fe1cb |   3.5.6 |  7.9 MB |     false |      false |        16 |    2014832 |            2014832 |        |
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

etcd 环境设置¶

`etcd` 环境设置¶