ETCD集群安装

ETCD集群安装

 

本文使用vultr虚拟主机实现

邀请注册链接：http://www.vultr.com/?ref=6940267

 

 

购买三台位于东京的主机，东京的主机下载速度比较快 

 

每个主机安装一下常用的软件

yum upgrade -y

yum install -y tree git wget p7zip bridge-utils net-tools vim unzip

 

配置这三台主机的内网IP地址

参考 www.vultr.com 页面中 Sample Network Configuration

 

修改主机名

修改/etc/sysconfig/network 不生效

配置各机器的主机名

echo "HOSTNAME=vultr.guest-10" >> /etc/sysconfig/network

 

echo "HOSTNAME=vultr.guest-11" >> /etc/sysconfig/network

 

echo "HOSTNAME=vultr.guest-12" >> /etc/sysconfig/network

 

三台机器同时配置

echo "10.99.0.10 vultr.guest-10" >> /etc/hosts

echo "10.99.0.11 vultr.guest-11" >> /etc/hosts

echo "10.99.0.12 vultr.guest-12" >> /etc/hosts

 

直接修改各机器的以下这两个文件让hostname生效

echo "vultr.guest-10" >/proc/sys/kernel/hostname

echo "vultr.guest-10" >/etc/hostname

 

echo "vultr.guest-11" >/proc/sys/kernel/hostname

echo "vultr.guest-11" >/etc/hostname

 

echo "vultr.guest-12" >/proc/sys/kernel/hostname

echo "vultr.guest-12" >/etc/hostname

 

hostname

 

 

 

创建工作目录

mkdir -p /opt/etcd/

 

download etcd

wget https://github.com/coreos/etcd/releases/download/v3.1.3/etcd-v3.1.3-linux-amd64.tar.gz

 

tar -xvf etcd-v3.1.3-linux-amd64.tar.gz

 

cp -r etcd-v3.1.3-linux-amd64/etcd /opt/etcd/

cp -r etcd-v3.1.3-linux-amd64/etcdctl /opt/etcd/

 

ls -l /opt/etcd/

 

在三个节点机器上创建etcd启动文件

 

cat <<EOF >/lib/systemd/system/etcd.service

[Unit]

Description=ETCD

 

[Service]

Type=notify

EnvironmentFile=/etc/sysconfig/etcd

ExecStart=/opt/etcd/etcd \$ETCD_NAME \\

          \$INITIAL_ADVERTISE_PEER_URLS \\

          \$LISTEN_PEER_URLS \\

          \$ADVERTISE_CLIENT_URLS \\

          \$LISTEN_CLIENT_URLS \\

          \$INITIAL_CLUSTER_TOKEN \\

          \$INITIAL_CLUSTER \\

          \$INITIAL_CLUSTER_STATE \\

          \$ETCD_OPTS

Restart=on-failure

EOF

 

more /lib/systemd/system/etcd.service

 

设置etcd配置

三台机器各配置一遍（修改一个IP，使用内网IP）该文件为服务的配置文件，三台主机的ETCD_NAME、INITIAL_ADVERTISE_PEER_URLS和ADVERTISE_CLIENT_URLS参数各不相同

ETCD_NAME注意与INITIAL_CLUSTER中的配置一致

cat <<EOF >/etc/sysconfig/etcd

# configure file for etcd

 

# -name

ETCD_NAME='-name k8sETCD0'

# -initial-advertise-peer-urls

INITIAL_ADVERTISE_PEER_URLS='-initial-advertise-peer-urls http://10.99.0.10:2379'

# -listen-peer-urls

LISTEN_PEER_URLS='-listen-peer-urls http://0.0.0.0:2379'

# -advertise-client-urls

ADVERTISE_CLIENT_URLS='-advertise-client-urls http://10.99.0.10:2378,http://10.99.0.10:2380'

# -listen-client-urls

LISTEN_CLIENT_URLS='-listen-client-urls http://0.0.0.0:2378,http://0.0.0.0:2380'

# -initial-cluster-token

INITIAL_CLUSTER_TOKEN='-initial-cluster-token k8s-etcd-cluster'

# -initial-cluster

INITIAL_CLUSTER='-initial-cluster k8sETCD0=http://10.99.0.10:2379,k8sETCD1=http://10.99.0.12:2379,k8sETCD2=http://10.99.0.11:2379'

# -initial-cluster-state

INITIAL_CLUSTER_STATE='-initial-cluster-state new'

# other parameters

ETCD_OPTS=''

EOF

 

more /etc/sysconfig/etcd

 

--------

cat <<EOF >/etc/sysconfig/etcd

# configure file for etcd

 

# -name

ETCD_NAME='-name k8sETCD1'

# -initial-advertise-peer-urls

INITIAL_ADVERTISE_PEER_URLS='-initial-advertise-peer-urls http://10.99.0.11:2379'

# -listen-peer-urls

LISTEN_PEER_URLS='-listen-peer-urls http://0.0.0.0:2379'

# -advertise-client-urls

ADVERTISE_CLIENT_URLS='-advertise-client-urls http://10.99.0.11:2378,http://10.99.0.11:2380'

# -listen-client-urls

LISTEN_CLIENT_URLS='-listen-client-urls http://0.0.0.0:2378,http://0.0.0.0:2380'

# -initial-cluster-token

INITIAL_CLUSTER_TOKEN='-initial-cluster-token k8s-etcd-cluster'

# -initial-cluster

INITIAL_CLUSTER='-initial-cluster k8sETCD0=http://10.99.0.10:2379,k8sETCD1=http://10.99.0.11:2379,k8sETCD2=http://10.99.0.12:2379'

# -initial-cluster-state

INITIAL_CLUSTER_STATE='-initial-cluster-state new'

# other parameters

ETCD_OPTS=''

EOF

 

more /etc/sysconfig/etcd

 

----------

cat <<EOF >/etc/sysconfig/etcd

# configure file for etcd

 

# -name

ETCD_NAME='-name k8sETCD2'

# -initial-advertise-peer-urls

INITIAL_ADVERTISE_PEER_URLS='-initial-advertise-peer-urls http://10.99.0.12:2379'

# -listen-peer-urls

LISTEN_PEER_URLS='-listen-peer-urls http://0.0.0.0:2379'

# -advertise-client-urls

ADVERTISE_CLIENT_URLS='-advertise-client-urls http://10.99.0.12:2378,http://10.99.0.12:2380'

# -listen-client-urls

LISTEN_CLIENT_URLS='-listen-client-urls http://0.0.0.0:2378,http://0.0.0.0:2380'

# -initial-cluster-token

INITIAL_CLUSTER_TOKEN='-initial-cluster-token k8s-etcd-cluster'

# -initial-cluster

INITIAL_CLUSTER='-initial-cluster k8sETCD0=http://10.99.0.10:2379,k8sETCD1=http://10.99.0.11:2379,k8sETCD2=http://10.99.0.12:2379'

# -initial-cluster-state

INITIAL_CLUSTER_STATE='-initial-cluster-state new'

# other parameters

ETCD_OPTS=''

EOF

more /etc/sysconfig/etcd

 

-----------

 

 

启动时出现 “没有到主机的路由” 错误

centos7.0(默认是使用firewall作为防火墙，如若未改为iptables防火墙，使用以下命令查看和关闭防火墙)

查看防火墙状态：firewall-cmd --state

关闭防火墙：systemctl stop firewalld.service

 

firewall-cmd --state

systemctl stop firewalld.service

 

参考：

http://www.bubuko.com/infodetail-1013314.html

 

启动ETCD集群

 

systemctl daemon-reload

systemctl start etcd

 

检查etcd版本号

curl -L http://10.99.0.10:2380/version

curl -L http://10.99.0.11:2380/version

curl -L http://10.99.0.12:2380/version