通过systemd 管理 docker-etcd

by · 2018年01月03日 · 406 Words · ~1min reading time | Improve on


原文链接： 通过systemd 管理 docker-etcd

参考

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# make sure etcd process has write access to this directory
# remove this directory if the cluster is new; keep if restarting etcd
# rm -rf /tmp/etcd/s1


# to write service file for etcd with Docker

cat > /tmp/s1.service <<EOF
[Unit]
Description=etcd with Docker
Documentation=https://github.com/coreos/etcd

[Service]
Restart=always
RestartSec=5s
TimeoutStartSec=0
LimitNOFILE=40000

ExecStart=/usr/bin/docker \
  run \
  --rm \
  --net=host \
  --name etcd-v3.3.0-rc.0 \
  --volume=/docker/etcd/s1:/etcd-data \
  gcr.io/etcd-development/etcd:v3.3.0-rc.0 \
  /usr/local/bin/etcd \
  --name s1 \
  --data-dir /etcd-data \
  --listen-client-urls http://localhost:2379 \
  --advertise-client-urls http://localhost:2379 \
  --listen-peer-urls http://localhost:2380 \
  --initial-advertise-peer-urls http://localhost:2380 \
  --initial-cluster s1=http://localhost:2380,s2=http://localhost:22380,s3=http://localhost:32380 \
  --initial-cluster-token tkn \
  --initial-cluster-state new \
  --auto-compaction-retention 1

ExecStop=/usr/bin/docker stop etcd-v3.3.0-rc.0

[Install]
WantedBy=multi-user.target
EOF

sudo mv /tmp/s1.service /etc/systemd/system/s1.service


# to start service
sudo systemctl daemon-reload
sudo systemctl cat s1.service
sudo systemctl enable s1.service
sudo systemctl start s1.service

# to get logs from service
sudo systemctl status s1.service -l --no-pager
sudo journalctl -u s1.service -l --no-pager|less
sudo journalctl -f -u s1.service

# to stop service
sudo systemctl stop s1.service
sudo systemctl disable s1.service

机器环境变量设置

每台机器设置以下环境变量

export ETCD_VERSION=v3.1.0-alpha.1
export TOKEN=my-etcd-token
export CLUSTER_STATE=new
export NAME_1=etcd-node-0
export NAME_2=etcd-node-1
export NAME_3=etcd-node-2
export HOST_1=192.168.56.101
export HOST_2=192.168.56.104
export HOST_3=192.168.56.105
export CLUSTER=${NAME_1}=http://${HOST_1}:2380,${NAME_2}=http://${HOST_2}:2380,${NAME_3}=http://${HOST_3}:2380

每个机器安装etcd容器

进入HOST_1机器，设置环境变量和起容器。

export THIS_NAME=${NAME_1}
export THIS_IP=${HOST_1}

sudo docker run -d --net=host --name etcd quay.io/coreos/etcd:${ETCD_VERSION}

/usr/local/bin/etcd \
--data-dir=data.etcd --name ${THIS_NAME} \
--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
--initial-cluster ${CLUSTER} \
--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

进入HOST_2机器，设置环境变量和起容器

export THIS_NAME=${NAME_2}
export THIS_IP=${HOST_2}
sudo docker run --net=host -d --name etcd quay.io/coreos/etcd:${ETCD_VERSION}

/usr/local/bin/etcd \
--data-dir=data.etcd --name ${THIS_NAME} \
--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
--initial-cluster ${CLUSTER} \
--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

进入HOST_3机器，设置环境变量和起容器

export THIS_NAME=${NAME_3}
export THIS_IP=${HOST_3}
sudo docker run --net=host -d --name etcd quay.io/coreos/etcd:${ETCD_VERSION}

/usr/local/bin/etcd \
--data-dir=data.etcd --name ${THIS_NAME} \
--initial-advertise-peer-urls http://${THIS_IP}:2380 --listen-peer-urls http://${THIS_IP}:2380 \
--advertise-client-urls http://${THIS_IP}:2379 --listen-client-urls http://${THIS_IP}:2379 \
--initial-cluster ${CLUSTER} \
--initial-cluster-state ${CLUSTER_STATE} --initial-cluster-token ${TOKEN}

测试集群运行情况：

docker exec etcd /bin/sh -c "export ETCDCTL_API=3 && /usr/local/bin/etcdctl put foo bar"

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