centos7安装部署etcd集群

ETCD, 数据库 / 作者：

ETCD集群节点：

角色 系统 节点
master CentOS-7 192.168.10.5
node-1 CentOS-7 192.168.10.6
node-2 CentOS-7 192.168.10.7 


yum安装etcd




#配置阿里epel源：

mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup

mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo




yum install etcd

yum list installed |grep -i etcd




Master配置修改介绍


[root@master etcd]# egrep -v "^$|^#" /etc/etcd/etcd.conf

ETCD_DATA_DIR="/var/lib/etcd/default.etcd" #etcd数据保存目录
ETCD_LISTEN_PEER_URLS="http://192.168.10.5:2380" #集群内部通信使用的URL
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379" #供外部客户端使用的url
ETCD_NAME="etcd01" #etcd实例名称
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.10.5:2380" #广播给集群内其他成员访问的URL
ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379" #广播给外部客户端使用的url
ETCD_INITIAL_CLUSTER="etcd01=http://192.168.10.5:2380,etcd02=http://192.168.10.6:2380,etcd03=http://192.168.10.7:2380" #初始集群成员列表
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster" #集群的名称
ETCD_INITIAL_CLUSTER_STATE="new" #初始集群状态，new为新建集群




node1 etcd 配置


[root@node1 etcd]# egrep -v "^$|^#" /etc/etcd/etcd.conf
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.10.6:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_NAME="etcd02"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.10.6:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_INITIAL_CLUSTER="etcd01=http://192.168.10.5:2380,etcd02=http://192.168.10.6:2380,etcd03=http://192.168.10.7:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="exist"


node2 etcd 配置


[root@node2 ~]# egrep -v "^$|^#" /etc/etcd/etcd.conf
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="http://192.168.10.7:2380"
ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_NAME="etcd03"
ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.10.7:2380"
ETCD_ADVERTISE_CLIENT_URLS="http://0.0.0.0:2379"
ETCD_INITIAL_CLUSTER="etcd01=http://192.168.10.5:2380,etcd02=http://192.168.10.6:2380,etcd03=http://192.168.10.7:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="exist"


添加系统服务命令














1


2


3


4


5


6


7


8


9


10


11


12


13


14


15


16


17


18


19






[root@localhost etcd]# cat /usr/lib/systemd/system/etcd.service


[Service]


Type=notify


WorkingDirectory=/var/lib/etcd/


EnvironmentFile=-/etc/etcd/etcd.conf


User=etcd


# set GOMAXPROCS to number of processors


ExecStart=/bin/bash -c "GOMAXPROCS=$(nproc) /usr/bin/etcd \


--name=\"${ETCD_NAME}\" \


--data-dir=\"${ETCD_DATA_DIR}\" \


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


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


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


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


--initial-cluster=\"${ETCD_INITIAL_CLUSTER}\"  \


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


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


Restart=on-failure


LimitNOFILE=65536
















以上操作在 master、node2、node3 节点上都需要操作,需要修改对应的ip


启动 etcd


依次启动 node1、node2、node3 节点的 etcd














1


2


3






systemctl start etcd.service


systemctl status etcd.service


systemctl enable etcd.service


















验证 etcd集群


# 查看集群节点
[root@master etcd]# etcdctl member list
315fd62e577c4037: name=etcd03 peerURLs=http://192.168.10.7:2380 clientURLs=http://0.0.0.0:2379 isLeader=false
4c5d727d37966a87: name=etcd01 peerURLs=http://192.168.10.5:2380 clientURLs=http://0.0.0.0:2379 isLeader=true
f617da66fb9b90ad: name=etcd02 peerURLs=http://192.168.10.6:2380 clientURLs=http://0.0.0.0:2379 isLeader=false

#查看集群健康状态：

[root@master etcd]# etcdctl cluster-health
member 315fd62e577c4037 is healthy: got healthy result from http://0.0.0.0:2379
member 4c5d727d37966a87 is healthy: got healthy result from http://0.0.0.0:2379
member f617da66fb9b90ad is healthy: got healthy result from http://0.0.0.0:2379
cluster is healthy





设置键值：


在一个节点设置值
[root@master etcd]# etcdctl set /test/key "test kubernetes"
test kubernetes
 
在另一个节点获取值
[root@node1 etcd]# etcdctl get /test/key
test kubernetes

key存在的方式和zookeeper类似，为 /路径/key
设置完之后，其他集群也可以查询到该值
如果dir和key不存在，该命令会创建对应的项


更新键值：


[root@master etcd]# etcdctl update /test/key "test kubernetes cluster"
test kubernetes cluster
 
[root@node1 etcd]# etcdctl get /test/key
test kubernetes cluster


删除键值：


[root@master etcd]# etcdctl rm /test/key
PrevNode.Value: test kubernetes cluster
 
# 当键不存在时，会报错
[root@node1 etcd]# etcdctl get /test/key
Error:  100: Key not found (/test/key) [15]


通过api接口验证


验证集群的状态，从三个node返回的v2/members数据是一样的值。

curl -L http://127.0.0.1:2380/v2/members

通过curl添加查询信息

curl -L http://127.0.0.1:32789/v2/keys/foo -XPUT -d value="Hello foo"
curl -L http://127.0.0.1:32789/v2/keys/foo1/foo1 -XPUT -d value="Hello foo1"
curl -L http://127.0.0.1:32789/v2/keys/foo2/foo2 -XPUT -d value="Hello foo2"
curl -L http://127.0.0.1:32789/v2/keys/foo2/foo21/foo21 -XPUT -d value="Hello foo21"

curl -L http://127.0.0.1:32787/v2/keys/foo
curl -L http://127.0.0.1:32787/v2/keys/foo2
curl -L http://127.0.0.1:32787/v2/keys/foo2?recursive=true


		
		
			




	




	



	
	
	
		

		
发表评论