coreos是一个专门为大规模服务器部署定制的linux精简系统,它将操作系统和应用程序完全分离,从而降低操作系统和应用程序的耦合度,同时解决了现有linux服务器在容器资源、权限管理方面出现的问题。就目前来说,coreos会是未来操作系统的发展趋势。
那你有没有亲自在coreos上部署一个应用程序呢?相信大多数人都没有过这样的经验,在coreos上建立一个应用程序可以说是非常辛苦及沮丧的。因为在开始建立程序之前你首先必须了解所有不同的技术。
下面,我们将手把手地教你来创建一个简单的wordpress应用程序,采用mysql作为服务器,在coreos上运行。
1. 安装cli来控制coreos
如果你的电脑是mac,可以在本机安装fleetctl和etcdctl来控制coreos集群:
使用部署虚拟化开发环境vagrant来安装本地集群很容易:
fleetctl命令可把应用程序部署到coreos集群的节点中,但要为fleet写服务文件真的是太糟糕了。幸运的是,你不必自己编写,你可以使用yaml format来生成服务文件:
$ cat fig.yml
web:
image: ctlc/wordpress
ports:
- 80:80
environment:
db_user: root
db_password: qa1n76pwari9
links:
- db
db:
image: ctlc/mysql
ports:
- 3306:3306
environment:
mysql_database: wordpress
mysql_root_password: qa1n76pwari9
$ fig2coreos myapp fig.yml coreos-files
$ cd coreos-files
$ ls
db-discovery.1.service
db.1.service
web-discovery.1.service
web.1.service
$ fleetctl list-units
unit load active sub desc machine
db.1.service loaded active running run db_1 9c008961.../10.0.2.15
$ fleetctl start web.1.service
$ fleetctl list-units
unit load active sub desc machine
db.1.service loaded active running run db_1 9c008961.../10.0.2.15
web.1.service loaded active running run web_1 9c008961.../10.0.2.15
$ fleetctl list-units
unit load active sub desc machine
db-discovery.1.service loaded active running announce db_1 9c008961.../10.0.2.15
db.1.service loaded active running run db_1 9c008961.../10.0.2.15
web-discovery.1.service loaded active running announce web_1 9c008961.../10.0.2.15
web.1.service loaded active running run web_1 9c008961.../10.0.2.15
$ etcdctl ls --recursive
/services
/services/web
/services/web/web_1
/services/db
/services/db/db_1
$ etcdctl get /services/web/web_1
{ "host": "core-03", "port": 80, "version": "52c7248a14" }
$ etcdctl get /services/db/db_1
{ "host": "core-03", "port": 3306, "version": "52c7248a14" }
# find out which box is hosting your port 80
$ etcdctl get /services/web/web_1
{ "host": "core-03", "port": 80, "version": "52c7248a14" }
$ vagrant share core-03 --http 80
==> core-03: detecting network information for machine...
core-03: local machine address: 192.168.65.2
core-03: local http port: 80
core-03: local https port: disabled
==> core-03: checking authentication and authorization...
==> core-03: creating vagrant share session...
core-03: share will be at: quick-iguana-4689
==> core-03: your vagrant share is running! name: quick-iguana-4689
==> core-03: url: http://quick-iguana-4689.vagrantshare.com
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