[轉] etcd 搭建與使用

[From] https://blog.csdn.net/ShouTouDeXingFu/article/details/81167302linux

 

 

etcdgit

一、下載etcd二進制文件包
         https://github.com/coreos/etcd/releases/download/v3.1.3/etcd-v3.1.3-linux-amd64.tar.gzgithub

二、解壓縮etcd-v3.1.3-linux-amd64.tar.gz,將其中的etcd和etcdctl兩個可執行文件複製到各節點的/usr/bin目錄
三、在各節點建立etcd的數據目錄
         mkdir -p /data/etcdless

         mkdir /etc/etcdurl

四、在每一個節點上建立etcd的systemd unit文件/usr/lib/systemd/system/etcd.service 和  /etc/etcd/etcd.conf  
  spa

etcd.service .net

[Unit]

Description=Etcd Server

After=network.target

After=network-online.target

Wants=network-online.target

Documentation=https://github.com/coreos

[Service]

Type=notify

WorkingDirectory=/var/lib/etcd/

EnvironmentFile=-/etc/etcd/etcd.conf

ExecStart=/usr/bin/etcd \

--name ${ETCD_NAME} \

--cert-file=${ETCD_CERT_FILE} \

--key-file=${ETCD_KEY_FILE} \

--peer-cert-file=${ETCD_PEER_CERT_FILE} \

--peer-key-file=${ETCD_PEER_KEY_FILE} \

--trusted-ca-file=${ETCD_TRUSTED_CA_FILE} \

--peer-trusted-ca-file=${ETCD_PEER_TRUSTED_CA_FILE} \

--initial-advertise-peer-urls ${ETCD_INITIAL_ADVERTISE_PEER_URLS} \

--listen-peer-urls ${ETCD_LISTEN_PEER_URLS} \

--listen-client-urls ${ETCD_LISTEN_CLIENT_URLS} \

--advertise-client-urls ${ETCD_ADVERTISE_CLIENT_URLS} \

--initial-cluster-token ${ETCD_INITIAL_CLUSTER_TOKEN} \

--initial-cluster ${ETCD_INITIAL_CLUSTER} \

--initial-cluster-state ${ETCD_INITIAL_CLUSTER_STATE} \

--data-dir=${ETCD_DATA_DIR}

Restart=on-failure

RestartSec=5

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

 

etcd.conf    etcd集羣中配置文件標紅的配置不同,拷貝出來修改便可3d

ETCD_NAME="etcd1"

#20180108 by lys
#ETCD_CERT_FILE="/etc/k8s/kubernetes.pem"
#ETCD_KEY_FILE="/etc/k8s/kubernetes-key.pem"
#ETCD_PEER_CERT_FILE="/etc/k8s/kubernetes.pem"
#ETCD_PEER_KEY_FILE="/etc/k8s/kubernetes-key.pem"
#ETCD_TRUSTED_CA_FILE="/etc/k8s/ca.pem"
#ETCD_PEER_TRUSTED_CA_FILE="/etc/k8s/ca.pem"

ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd1.server.biz:2380"
ETCD_LISTEN_PEER_URLS="http://etcd1.server.biz:2380"
ETCD_LISTEN_CLIENT_URLS="http://etcd1.server.biz:2379,http://127.0.0.1:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://etcd1.server.biz:2379"

ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-0"
ETCD_INITIAL_CLUSTER="etcd1=http://etcd1.server.biz:2380,etcd2=http://etcd2.server.biz:2380,etcd3=http://etcd3.server.biz:2380"
ETCD_INITIAL_CLUSTER_STATE="new"
ETCD_DATA_DIR="/data/etcd"

 

配置信息說明
上面在啓動參數中指定了etcd的工做目錄和數據目錄是/data/etcd
--cert-file和--key-file分別指定etcd的公鑰證書和私鑰
--peer-cert-file和--peer-key-file分別指定了etcd的Peers通訊的公鑰證書和私鑰。
--trusted-ca-file指定了客戶端的CA證書
--peer-trusted-ca-file指定了Peers的CA證書
--initial-cluster-state new表示這是新初始化集羣,--name指定的參數值必須在--initial-cluster中
 日誌

 

五、啓動etcd
    systemctl daemon-reloadcode

    systemctl enable etcd

    systemctl start etcd

    systemctl status etcd

 

六、檢查集羣是否健康,在任一節點執行
              export ETCDCTL_API=3         

etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379   member list

       

etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379  endpoint status  -w table

 

etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379  endpoint health  -w table

          

    sudo journalctl -u etcd.service -l --no-pager|less   查看日誌

 

七、etcd集羣成員擴容增長
etcdctl --endpoints=http://etcd2.server.biz:2379,http://etcd1.server.biz:2379,http://etcd3.server.biz:2379 member add etcd4   --peer-urls=http://etcd4.server.biz:2380 
Member 5b316fb0b94e59f8 added to cluster f0364a493c8924dc

ETCD_NAME="etcd4"
ETCD_INITIAL_CLUSTER="etcd1=http://etcd1.server.biz:2380,etcd3=http://etcd3.server.biz:2380,etcd2=http://etcd2.server.biz:2380,etcd4=http://etcd4.server.biz:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

          此時,集羣會爲目標節點生成一個惟一的member ID  

注意:新節點加入集羣是做爲一個全新的節點加入,若是data-dir有數據,etcd啓動時會讀取己經存在的數據,啓動時仍然用的老member ID,也會形成,集羣不沒法加入,因此必定要清空新節點的data-dir   
新擴容的etcd機器的etcd.conf中配置修改成 ETCD_INITIAL_CLUSTER_STATE="existing"
刪除 rm-rf  /data/etcd/*
啓動etcd服務便可
 

 

常見問題
1) systemd: Failed at step CHDIR spawning /usr/bin/etcd: No such file or directory
    經過查看ll /usr/bin/etcd  啓動文件是存在的,後來發現etcd.service裏面指定了WorkingDirectory=/var/lib/etcd/  沒有建立對應目錄致使,建立了/var/lib/etcd/ 目錄應用啓動成功
 

2)etcd 添加集羣成員報錯Jul 23 16:58:25 bjzw_82_137 etcd: failed to process raft message (raft: stopped)Jul 23 16:58:25 bjzw_82_137 etcd: failed to find member c79c567db2d16966 in cluster f0364a493c8924dcJul 23 16:58:25 bjzw_82_137 etcd: failed to find member c79c567db2d16966 in cluster f0364a493c8924dcJul 23 16:58:25 bjzw_82_137 etcd: failed to find member b13dd19d11c8d25d in cluster f0364a493c8924dcJul 23 16:58:25 bjzw_82_137 etcd: failed to find member b13dd19d11c8d25d in cluster f0364a493c8924dc須要將etcd.conf中的配置修改成

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