docker集群软件之fleet安装
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
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yum install go -y
2、下载fleet
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cd /tmp/
git clone https://github.com/coreos/fleet.git
3、安装fleet
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cd fleet
./build
4、负责可执行程序
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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;
Description=Fleet
Documentation=https://github.com/coreos/fleet
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
WantedBy=multi-user.target
7、启动fleet
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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 10.10.17.3region=cn-core-04
cce83e1dd55b46f6a543b49a6b59586a 10.10.17.3region=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。
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