etcd學習(4)-centos7中部署etcd

Rick.lz發表於2021-07-29

CentOS

etcd的搭建

etcd的搭建

前言

這裡記錄下如何搭建etcd

單機

在etcd的releases中有安裝指令碼,安裝指令碼

這裡放一個docker的安裝指令碼

rm -rf /tmp/etcd-data.tmp && mkdir -p /tmp/etcd-data.tmp && \
  docker rmi quay.io/coreos/etcd:v3.5.0 || true && \
  docker run \
  -p 2379:2379 \
  -p 2380:2380 \
  --mount type=bind,source=/tmp/etcd-data.tmp,destination=/etcd-data \
  --name etcd-gcr-v3.5.0 \
  quay.io/coreos/etcd:v3.5.0 \
  /usr/local/bin/etcd \
  --name s1 \
  --data-dir /etcd-data \
  --listen-client-urls http://0.0.0.0:2379 \
  --advertise-client-urls http://0.0.0.0:2379 \
  --listen-peer-urls http://0.0.0.0:2380 \
  --initial-advertise-peer-urls http://0.0.0.0:2380 \
  --initial-cluster s1=http://0.0.0.0:2380 \
  --initial-cluster-token tkn \
  --initial-cluster-state new \
  --log-level info \
  --logger zap \
  --log-outputs stderr

叢集

這裡準備了三臺centos7機器

主機	ip
etcd-1	192.168.56.111
etcd-2	192.168.56.112
etcd-3	192.168.56.113

首先在每臺機器中安裝etcd,這裡寫了安裝的指令碼

$ cat etcd.sh 

ETCD_VER=v3.5.0

# choose either URL
GOOGLE_URL=https://storage.googleapis.com/etcd
GITHUB_URL=https://github.com/etcd-io/etcd/releases/download
DOWNLOAD_URL=${GITHUB_URL}

rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
rm -rf /opt/etcd && mkdir -p /opt/etcd

curl -L ${DOWNLOAD_URL}/${ETCD_VER}/etcd-${ETCD_VER}-linux-amd64.tar.gz -o /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz
tar xzvf /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz -C /opt/etcd --strip-components=1
rm -f /tmp/etcd-${ETCD_VER}-linux-amd64.tar.gz

賦予執行許可權

$ chmod +x etcd.sh

在每臺機器中都執行下

$ ./etcd.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   636  100   636    0     0   1328      0 --:--:-- --:--:-- --:--:--  1330
100 18.4M  100 18.4M    0     0   717k      0  0:00:26  0:00:26 --:--:--  775k
...

建立etcd配置檔案

$ mkdir /etc/etcd
$ vi /etc/etcd/conf.yml

節點1

name: etcd-1
data-dir: /opt/etcd/data
listen-client-urls: http://192.168.56.111:2379,http://127.0.0.1:2379
advertise-client-urls: http://192.168.56.111:2379,http://127.0.0.1:2379
listen-peer-urls: http://192.168.56.111:2380
initial-advertise-peer-urls: http://192.168.56.111:2380
initial-cluster: etcd-1=http://192.168.56.111:2380,etcd-2=http://192.168.56.112:2380,etcd-3=http://192.168.56.113:2380
initial-cluster-token: etcd-cluster-token
initial-cluster-state: new

節點2

name: etcd-2
data-dir: /opt/etcd/data
listen-client-urls: http://192.168.56.112:2379,http://127.0.0.1:2379
advertise-client-urls: http://192.168.56.112:2379,http://127.0.0.1:2379
listen-peer-urls: http://192.168.56.112:2380
initial-advertise-peer-urls: http://192.168.56.112:2380
initial-cluster: etcd-1=http://192.168.56.111:2380,etcd-2=http://192.168.56.112:2380,etcd-3=http://192.168.56.113:2380
initial-cluster-token: etcd-cluster-token
initial-cluster-state: new

節點3

name: etcd-3
data-dir: /opt/etcd/data
listen-client-urls: http://192.168.56.113:2379,http://127.0.0.1:2379
advertise-client-urls: http://192.168.56.113:2379,http://127.0.0.1:2379
listen-peer-urls: http://192.168.56.113:2380
initial-advertise-peer-urls: http://192.168.56.113:2380
initial-cluster: etcd-1=http://192.168.56.111:2380,etcd-2=http://192.168.56.112:2380,etcd-3=http://192.168.56.113:2380
initial-cluster-token: etcd-cluster-token
initial-cluster-state: new

配置項說明：

--name：etcd叢集中的節點名，這裡可以隨意，可區分且不重複就行
--listen-peer-urls：監聽的用於節點之間通訊的url，可監聽多個，叢集內部將通過這些url進行資料互動(如選舉，資料同步等)
--initial-advertise-peer-urls：建議用於節點之間通訊的url，節點間將以該值進行通訊
--listen-client-urls：監聽的用於客戶端通訊的url，同樣可以監聽多個
--advertise-client-urls：建議使用的客戶端通訊 url，該值用於 etcd 代理或 etcd 成員與 etcd 節點通訊
--initial-cluster-token： etcd-cluster-1，節點的 token 值，設定該值後叢集將生成唯一 id，併為每個節點也生成唯一 id，當使用相同配置檔案再啟動一個叢集時，只要該 token 值不一樣，etcd 叢集就不會相互影響
--initial-cluster：也就是叢集中所有的 initial-advertise-peer-urls 的合集
--initial-cluster-state：new，新建叢集的標誌

更新etcd系統預設配置

當前使用的是etcd v3版本，系統預設的是v2，通過下面命令修改配置。

$ vi /etc/profile
# 在末尾追加  
export ETCDCTL_API=3
# 然後更新
$ source /etc/profile

啟動

$ ./etcd --config-file=/etc/etcd/conf.yml

配置ETCD為啟動服務

編輯/usr/lib/systemd/system/etcd.service

$ cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=EtcdServer
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
WorkingDirectory=/opt/etcd/
# User=etcd
ExecStart=/opt/etcd/etcd --config-file=/etc/etcd/conf.yml
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

更新啟動：

$ systemctl daemon-reload
$ systemctl enable etcd
$ systemctl start etcd
$ systemctl restart etcd

$ systemctl status etcd.service -l

測試下

複製etcd二進位制檔案到/usr/local/bin/

$ cp /opt/etcd/etcd* /usr/local/bin/

首先設定ETCD_ENDPOINTS

# export ETCDCTL_API=3
# export ETCD_ENDPOINTS=192.168.56.111:2379,192.168.56.112:2379,192.168.56.113:2379

檢視狀態

$ etcdctl --endpoints=${ETCD_ENDPOINTS} --write-out=table member list
+------------------+---------+--------+----------------------------+--------------------------------------------------+------------+
|        ID        | STATUS  |  NAME  |         PEER ADDRS         |                   CLIENT ADDRS                   | IS LEARNER |
+------------------+---------+--------+----------------------------+--------------------------------------------------+------------+
|  90d224ceb3098d7 | started | etcd-2 | http://192.168.56.112:2380 | http://127.0.0.1:2379,http://192.168.56.112:2379 |      false |
| 3b23fbb7d9c7cd10 | started | etcd-1 | http://192.168.56.111:2380 | http://127.0.0.1:2379,http://192.168.56.111:2379 |      false |
| 7909c74e3f5ffafa | started | etcd-3 | http://192.168.56.113:2380 | http://127.0.0.1:2379,http://192.168.56.113:2379 |      false |
+------------------+---------+--------+----------------------------+--------------------------------------------------+------------+

$ etcdctl --endpoints=${ETCD_ENDPOINTS} --write-out=table endpoint health
+---------------------+--------+------------+-------+
|      ENDPOINT       | HEALTH |    TOOK    | ERROR |
+---------------------+--------+------------+-------+
| 192.168.56.111:2379 |   true | 6.558088ms |       |
| 192.168.56.113:2379 |   true | 6.543104ms |       |
| 192.168.56.112:2379 |   true | 7.405801ms |       |
+---------------------+--------+------------+-------+

$ etcdctl --endpoints=${ETCD_ENDPOINTS} --write-out=table endpoint status
+---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|      ENDPOINT       |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.56.111:2379 | 3b23fbb7d9c7cd10 |   3.5.0 |   20 kB |      true |      false |         2 |         19 |                 19 |        |
| 192.168.56.112:2379 |  90d224ceb3098d7 |   3.5.0 |   20 kB |     false |      false |         2 |         19 |                 19 |        |
| 192.168.56.113:2379 | 7909c74e3f5ffafa |   3.5.0 |   20 kB |     false |      false |         2 |         19 |                 19 |        |
+---------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+

在etcd-1中watch一個key,然後再etcd-2中對key設定一個值

[root@centos7-1 ~]# etcdctl watch test
PUT
test
xiaoming

[root@centos7-3 ~]# etcdctl put test xiaoming
OK

參考

【ETCD叢集安裝配置】https://zhuanlan.zhihu.com/p/46477992
【Install】https://etcd.io/docs/v3.5/install/
【徹底搞懂 etcd 系列文章（三）：etcd 叢集運維部署】https://developer.aliyun.com/article/765312

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etcd學習(4)-centos7中部署etcd

etcd的搭建

前言

單機

叢集

建立etcd配置檔案

更新etcd系統預設配置

啟動

配置ETCD為啟動服務

測試下

參考

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