Deploying WordPress instance tutorial under coreos

CoreOS Is a special for large-scale The server Deploy custom Linux Streamline systems , It completely separates the operating system from the application , Thus reducing the coupling between the operating system and the application , At the same time, it solves the existing Linux The server In container resources 、 Problems in permission management . For now ,CoreOS It will be the development trend of the future operating system .

Have you been there in person CoreOS Deploy an application ？ I believe most people have never had such experience , stay CoreOS It can be said to be very hard and frustrating to build an application on . Because before you start to build a program, you must first understand all the different technologies .

below , We will teach you hand in hand to create a simple WordPress Applications , use MySQL As The server , stay CoreOS Up operation .

The server operating system CoreOS First experience http://www.linuxidc.com/Linux/2014-07/104807.htm

1. install CLI To control CoreOS

If your computer is Mac, It can be installed locally fleetctl and etcdctl To control CoreOS colony ：

$ brew install go etcdctl
$ git clone https://github.com/coreos/fleet.git
$ cd fleet
$ ./build
$ mv bin/fleetctl /usr/local/bin/

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2. Install local colony

Use deployment virtualization development environment Vagrant To install local colony be prone to ：

$ git clone https://github.com/CenturyLinkLabs/coreos-vagrant
$ cd coreos-vagrant/cluster
$ vagrant up --provision

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Now the cluster is installed , Easy ！ Now let's check the local fleetctl：

$ fleetctl list-machines
MACHINE	IP	METADATA
09fd0a88...	10.0.2.15	-
77763947...	10.0.2.15	-
f31c383c...	10.0.2.15	-

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That's great , It works ！

3. Use fleet Deploy an application

fleetctl The command can deploy the application to CoreOS In the nodes of the cluster , But for fleet Writing service files is really terrible . Fortunately, , You don't have to write it yourself , You can use yaml format To generate service files ：

$ sudo gem install bundler fig2coreos

$ 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

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fleetctl The client tool uses etcd Systematic Key/Value Storage form , To share configuration and service discovery . Here is how to deploy the program to the cluster ：

$ fleetctl start db.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

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Now the program is running , But I haven't registered yet etcd Service for , Fortunately, fig2coreos The generated service discovery file can help us ：

$ fleetctl start db-discovery.1.service
$ fleetctl start web-discovery.1.service

$ 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" }

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That's it ！ If you're using Vagrant 1.5 And Vagrant Cloud, Then you can achieve WordPress Program and see that it can be implemented ：

$ cd ~/coreos-vagrant/cluster/

# 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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The following is the finished rendering ：

In fact, we can be in CoreOS I can do many things , Today, this is just the foundation , You can have a try if you are interested .