etcd集羣的搭建

因爲最近在學習kubernetes,etcd做爲kubernetes集羣的主數據庫，必須先啓動。

etcds實例名稱	IP地址	Hostname
etcd 1	192.168.142.161	kubernetes-node1.example.com
etcd 2	192.168.142.162	kubernetes-node2.example.com
etcd 3	192.168.142.163	kubernetes-node3.example.com

從GitHub官網上下載etcd發佈的二進制文件，etcd和etcdctl文件複製到/usr/bin目錄。

• 設置systemd服務文件。

vim /usr/lib/systemd/system/etcd.service
內容以下：
[Unit]
Description=Etcd Server
After=network.target


[Service]
Type=simple
WorkingDirectory=/var/lib/etcd/   
EnvironmentFile=-/etc/etcd/etcd.conf #配置文件路徑
ExecStart=/usr/bin/etcd
Type=notify
[Install]
WantedBy=multi-user.target

• 編寫/etc/etcd/etcd.conf文件

vim /etc/etcd/etcd.conf
# [member]
ETCD_NAME=etcd1   #etcd實例名稱
ETCD_DATA_DIR="/var/lib/etcd"  #etcd數據保存目錄
ETCD_LISTEN_CLIENT_URLS="http://192.168.142.161:2379,http://127.0.0.1:2379"
#供外部客戶端使用的url
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.142.161:2379,http://127.0.0.1:2379"
#廣播給外部客戶端使用的url

#[cluster]
ETCD_LISTEN_PEER_URLS="http://192.168.142.161:2380"   #集羣內部通訊使用的URL
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.142.161:2380"
#廣播給集羣內其餘成員訪問的URL
ETCD_INITIAL_CLUSTER="etcd1=http://192.168.142.161:2380,etcd2=http://192.168.142.162:2380,etcd3=http://192.168.142.163:2380"
#初始集羣成員列表
ETCD_INITIAL_CLUSTER_STATE="new"
#初始集羣狀態，new爲新建集羣
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"  #集羣的名稱

• 啓動etcd1服務器上的etcd服務。

  systemctl restart etcd

• etcd2和etcd3爲加入k8s-etcd-cluster集羣的實例，須要將其ETCD_INITIAL_CLUSTER_STATE設置爲"exist"。etcd2的完整配置以下：

# [member]
ETCD_NAME=etcd2
ETCD_DATA_DIR="/var/lib/etcd"
ETCD_LISTEN_CLIENT_URLS="http://192.168.142.162:2379,http://127.0.0.1:2379"
ETCD_ADVERTISE_CLIENT_URLS="http://192.168.142.162:2379,http://127.0.0.1:2379"

#[cluster]
ETCD_LISTEN_PEER_URLS="http://192.168.142.162:2380"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.142.162:2380"
ETCD_INITIAL_CLUSTER="etcd1=http://192.168.142.161:2380,etcd2=http://192.168.142.162:2380,etcd3=http://192.168.142.163:2380"
ETCD_INITIAL_CLUSTER_STATE="exist"
ETCD_INITIAL_CLUSTER_TOKEN="k8s-etcd-cluster"

• 啓動etcd2和etcd3服務器上的etcd服務。

  systemctl restart etcd

  啓動完成後，在任意節點執行etcdctl cluster-healthy命令來查看運行狀態。

  使用etcdctl member list 來查看集羣中的成員列表。

另一種安裝方法

etcd集羣搭建
下載二進制軟件包
https://github.com/coreos/etcd/releases   

解壓

將兩個執行文件複製到/usr/bin/
etcd和etcdctl文件複製到/usr/bin目錄

配置etcd-1

vi /etc/etcd/etcd.yml


name: etcd-1
data-dir: /var/lib/etcd
listen-client-urls: http://163.44.167.92:2379,http://127.0.0.1:2379
advertise-client-urls: http://163.44.167.92:2379,http://127.0.0.1:2379
listen-peer-urls: http://163.44.167.92:2380
initial-advertise-peer-urls: http://163.44.167.92:2380
initial-cluster: etcd-1=http://163.44.167.92:2380,etcd-2=http://150.95.148.52:2380,etcd-3=http://133.130.122.48:2380
initial-cluster-token: etcd-cluster-token
initial-cluster-state: new

配置etcd-2

vi /etc/etcd/etcd.yml
name: etcd-2
data-dir: /var/lib/etcd
listen-client-urls: http://150.95.148.52:2379,http://127.0.0.1:2379
advertise-client-urls: http://150.95.148.52:2379,http://127.0.0.1:2379
listen-peer-urls: http://150.95.148.52:2380
initial-advertise-peer-urls: http://150.95.148.52:2380
initial-cluster: etcd-1=http://163.44.167.92:2380,etcd-2=http://150.95.148.52:2380,etcd-3=http://133.130.122.48:2380
initial-cluster-token: etcd-cluster-token
initial-cluster-state: new


配置etcd-3
name: etcd-3
data-dir: /var/lib/etcd
listen-client-urls: http://133.130.122.48:2379,http://127.0.0.1:2379
advertise-client-urls: http://133.130.122.48:2379,http://127.0.0.1:2379
listen-peer-urls: http://133.130.122.48:2380
initial-advertise-peer-urls: http://133.130.122.48:2380
initial-cluster: etcd-1=http://163.44.167.92:2380,etcd-2=http://150.95.148.52:2380,etcd-3=http://133.130.122.48:2380
initial-cluster-token: etcd-cluster-token
initial-cluster-state: new



最後啓動
etcd --config-file=/etc/etcd/etcd.yml &

查當作員
etcdctl member list
每一個節點上執行查看健康狀態
etcdctl cluster-health