ubuntu20.04下使用juju+maas環境部署k8s-14-删除并建立etcd節點

參考文檔：

etcd charm

etcdctl報錯x509

ETCD 使用

使用ubuntu charmed kubernetes 部署一套生産環境的叢集

因為etcd/2在安裝時使用了錯誤的節點，是以想将錯誤節點的etcd删除并重建。

删除節點

juju remove-unit etcd/2 --force --no-wait
           

重建節點

juju add-machine --constraints tags=etcd
machine 13
juju add-unit etcd --to 13
           

顯示狀态

juju status
etcd/0*                   active    idle   1        10.0.4.139      2379/tcp        UnHealthy with 3 known peers
etcd/3                    waiting   idle   17       10.0.4.153                      Waiting to retry etcd registration
           

研究了下，應該是etcd的節點資訊中原來的etcd/2沒有除去，是以新增節點增加不進去。

擷取憑證資訊：

juju run-action --wait etcd/0 package-client-credentials
juju scp etcd/0:etcd_credentials.tar.gz etcd_credentials.tar.gz
           

解壓：

tar  -zxvf  etcd_credentials.tar.gz
etcd_credentials/
etcd_credentials/ca.crt
etcd_credentials/README.txt
etcd_credentials/client.crt
etcd_credentials/client.key
           

轉移到/root/etcd_credentials/目錄

cd /root/etcd_credentials/
           

手工輸入環境變量,因為etcd版本為3.4.5 ，是以格式如下：

juju expose etcd
export ETCDCTL_KEY=$(pwd)/client.key
export ETCDCTL_CERT=$(pwd)/client.crt
export ETCDCTL_CACERT=$(pwd)/ca.crt
export ETCDCTL_API=3  #否則會出現509錯誤
export ETCDCTL_ENDPOINT=https://10.0.4.139:2379       # etcd/0的ip

           

列出成員清單：

etcdctl member list
           

出現了如下錯誤：

Error:  dial tcp 127.0.0.1:2379: connect: connection refused
           

查了下指令，原來在現在的k8s中，etcdctl指令格式變了，需要增加端點參數

--endpoints=https://10.0.4.139:2379

：

#10.0.4.139為處于leadership的etcd節點IP，目前為etcd/0節點。

如檢驗端點健康狀态：

etcdctl --endpoints=https://10.0.4.139:2379 endpoint health

https://10.0.4.139:2379 is healthy: successfully committed proposal: took = 8.609559ms
           

列出成員名單：

etcdctl --endpoints=https://10.0.4.139:2379 member list
bb605e8c9ebece4, started, etcd0, https://10.0.4.139:2380, https://10.0.4.139:2379
54bba7baf27ccef7, started, etcd1, https://10.0.4.140:2380, https://10.0.4.140:2379
defc4e8a9c8f25bc, started, etcd2, https://10.0.4.145:2380, https://10.0.4.145:2379
           

其中

defc4e8a9c8f25bc, started, etcd2, https://10.0.4.145:2380, https://10.0.4.145:2379

，就是已經删除的etcd節點，需要etcdctl删除。

删除多餘的etcd節點：

etcdctl --endpoints=https://10.0.4.139:2379 member remove defc4e8a9c8f25bc
Member defc4e8a9c8f25bc removed from cluster 22b26385f89f7fa8
           

在過一會兒，新增的etcd節點已經添加到etcd叢集中了

juju status
etcd/0*                   active    idle   1        10.0.4.139      2379/tcp        Healthy with 2 known peers
  filebeat/2              active    idle            10.0.4.139                      Filebeat ready.
etcd/1                    active    idle   2        10.0.4.140      2379/tcp        Healthy with 3 known peers
  filebeat/1              active    idle            10.0.4.140                      Filebeat ready.
etcd/4                    active    idle   17       10.0.4.153      2379/tcp        Healthy with 3 known peers
  filebeat/10             active    idle            10.0.4.153                      Filebeat ready.