月度归档：2018年05月

使用Docker部署单节点etcd

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为了能使Docker外的系统访问到etcd服务，需要通过docker inspect获得容器的IP。或者也可以通过参数–net=host使容器使用主机的网络。

export NODE1=192.168.1.21
docker run \
  -p 2379:2379 \
  -p 2380:2380 \
  --volume=${DATA_DIR}:/etcd-data \
  --name etcd quay.io/coreos/etcd:latest \
  /usr/local/bin/etcd \
  --data-dir=/etcd-data --name node1 \
  --initial-advertise-peer-urls http://${NODE1}:2380 --listen-peer-urls http://${NODE1}:2380 \
  --advertise-client-urls http://${NODE1}:2379 --listen-client-urls http://${NODE1}:2379 \
  --initial-cluster node1=http://${NODE1}:2380
etcdctl --endpoints=http://${NODE1}:2379 member list

将容器作为systemd服务来运行

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编写/etc/systemd/system/myapp.service内容如下

[Unit]
Description=MyApp
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill busybox1
ExecStartPre=-/usr/bin/docker rm busybox1
ExecStartPre=/usr/bin/docker pull busybox
ExecStart=/usr/bin/docker run --name busybox1 busybox /bin/sh -c "trap 'exit 0' INT TERM; while true; do echo Hello World; sleep 1; done"

[Install]
WantedBy=multi-user.target

配置作为服务自动启动
sudo systemctl enable myapp.service
sudo systemctl start myapp.service
检查服务运行状态
journalctl -f -u hello.service

CoreOS ISO引导安装

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1. 从官网下载最新CoreOS ISO文件
https://stable.release.core-os.net/amd64-usr/current/coreos_production_iso_image.iso

2. 修改SSH配置
使用ISO文件引导Live CD，复制sshd_config文件
cd /etc/ssh
sudo mv sshd_config{,.bak}
sudo cp /usr/share/ssh/sshd_config .
sudo vi sshd_config
增加一行PermitRootLogin yes
sudo systemctl restart sshd
sudo passwd root

3. 通过SSH将ignition.json复制到服务器
ignition.json文件内容如下

{
  "ignition": {
    "config": {},
    "timeouts": {},
    "version": "2.1.0"
  },
  "networkd": {},
  "passwd": {
    "users": [
      {
        "name": "core",
        "sshAuthorizedKeys": [
          "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDGdByTgSVHq......."
        ]
      }
    ]
  },
  "storage": {},
  "systemd": {}
}

4. 将CoreOS安装到磁盘
sudo coreos-install -d /dev/sda -C stable -i ~/ignition.json

Docker Compose安装

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两进制安装：

sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) \
-o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
$ docker-compose --version
docker-compose version 1.21.2, build a133471

pip安装：

pip install docker-compose