docker集群软件之fleet安装

32ew12

fleet的介绍，info里复制的

1	fleet 是一个通过 Systemd对CoreOS 集群中进行控制和管理的工具。fleet 与 Systemd 之间通过 D-Bus API 进行交互，每个 fleet agent 之间通过 etcd 服务来注册和同步数据。fleet 提供的功能非常丰富，包括查看集群中服务器的状态、启动或终止 Docker container、读取日志内容等。

简单来说，我搭建docker集群，使用etcd作为信息存储，fleet连接与控制所有节点服务器的systemd，然后通过想用的命令创建或者消灭节点里docker容器。
下面是我自己画的一个fleet的架构图

fleet与etcd都是coreos开发，内置到coreos系统里，但我后来在弄docker集群的时候，在centos7系统里部署与使用这2个软件，使用起来很方便。
下面是安装
1、安装go

1	yum install go -y

2、下载fleet

1 2	cd /tmp/ git clone https://github.com/coreos/fleet.git

3、安装fleet

1 2	cd fleet ./build

4、负责可执行程序

1 2	cp bin/fleetd /usr/local/bin/ cp bin/fleetctl /usr/local/bin/

5、配置fleet

在某一个节点里编辑与配置/etc/fleet/fleet.conf

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09:15:02 # cat /etc/fleet/fleet.conf # This config file is INI-formatted # Lower the logging threshold. Acceptable values are 0, 1, and 2. A higher # value corresponds to a lower logging threshold. # verbosity=0 # Provide a custom set of etcd endpoints. The default value is determined # by the underlying go-etcd library. #etcd_servers=["http://192.168.65.2:4001"] # Amount of time in seconds to allow a single etcd request before considering it failed. # etcd_request_timeout=1.0 # Provide TLS configuration when SSL certificate authentication is enabled in etcd endpoints # etcd_cafile=/path/to/CAfile # etcd_keyfile=/path/to/keyfile # etcd_certfile=/path/to/certfile # IP address that should be published with any socket information. By default, # no IP address is published. public_ip="10.10.27.221" # Comma-delimited key/value pairs that are published to the fleet registry. # This data can be referenced in unit files to affect scheduling descisions. # An example could look like: metadata="region=us-west,az=us-west-1" metadata="region=cn-core-02" # An Agent will be considered dead if it exceeds this amount of time to # communicate with the Registry. The agent will attempt a heartbeat at half # of this value. # agent_ttl="30s" # Interval at which the engine should reconcile the cluster schedule in etcd. # engine_reconcile_interval=2

基本只需要修改public_ip与metadata
6、配置启动脚本

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09:16:14 # cat /usr/lib/systemd/system/fleet.service; [Unit] Description=Fleet Documentation=https://github.com/coreos/fleet [Service] Type=simple EnvironmentFile=-/etc/fleet/fleet.conf ExecStart=/usr/local/bin/fleetd -config /etc/fleet/fleet.conf ExecStop=/usr/bin/killall -9 fleetd Restart=on-failure RestartSec=5s [Install] WantedBy=multi-user.target

7、启动fleet

1	systemctl start fleet

8、查看集群状态
我目前已经创建好了集群，并且有了4个节点

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09:15:06 # fleetctl list-machines -l MACHINE                 IP      METADATA 1a1b60030aaef2f1d8d0468f0000002d    10.10.21.199    region=cn-core-01 6d832c54a40fe752dba35d0b00000024    10.10.27.221    region=cn-core-02 893b160e363b4ec7834719a7f06e67cf    10.10.17.3  region=cn-core-04 cce83e1dd55b46f6a543b49a6b59586a    10.10.17.3  region=cn-core-03

其中machine是一个主机唯一的标示，ip是之前配置fleet.conf里的public_ip项，metadata是fleet.conf里metadata的。
目前已经建立好集群，请直接安装fleet前一定要先在每个节点安装etcd，否则fleet无法工作的，之后给大家整体介绍一个docker集群的真实案例。