用tsuru部署Go应用

概述

本文档是在tsuru中部署一个简单的Go应用的实战指南。

在tsuru中创建应用

使用app-create命令创建应用：

    $ tsuru app-create <app-name> <app-platform>

对于Go来说，应用平台是Go！让我们脑洞大开，开发一个’hello world‘教学应用，让我们叫它helloworld：

    $ tsuru app-create helloworld go

使用platform-list命令列出所有的可用的平台。使用app-list查看你所有的应用。

    $ tsuru app-list
    +-------------+-------------------------+--------------------------------+
    | Application | Units State Summary     | Address                        |
    +-------------+-------------------------+--------------------------------+
    | helloworld  | 0 of 0 units in-service | helloworld.192.168.50.4.nip.io |
    +-------------+-------------------------+--------------------------------+

应用的代码

用Go实现的一个简单web应用main.go：

  package main
    import (
        "fmt"
        "net/http"
        "os"
    )
    func main() {
        http.HandleFunc("/", hello)
        fmt.Println("listening...")
        err := http.ListenAndServe(":" + os.Getenv("PORT"), nil)
        if err != nil {
            panic(err)
        }
    }
    func hello(res http.ResponseWriter, req *http.Request) {
        fmt.Fprintln(res, "hello, world!")
    }

通过Git部署

在创建新的应用时，tsuru会显示应该使用的Git远程分支。用app-info命令可以获得其信息：

    $ tsuru app-info --app helloworld
    Application: helloworld
    Repository: git@192.168.50.4.nip.io:helloworld.git
    Platform: go
    Teams: admin
    Address: helloworld.192.168.50.4.nip.io
    Owner: admin@example.com
    Team owner: admin
    Deploys: 0
    Pool: theonepool
    App Plan:
    +---------------+--------+------+-----------+--------+---------+
    | Name          | Memory | Swap | Cpu Share | Router | Default |
    +---------------+--------+------+-----------+--------+---------+
    | autogenerated | 0 MB   | 0 MB | 100       |        | false   |
    +---------------+--------+------+-----------+--------+---------+

Git远程分支被用来通过Git部署应用。当修改被推送到tsuru远程分支时，项目同时也被部署：

    $ git push git@192.168.50.4.nip.io:helloworld.git master
    Counting objects: 3, done.
    Delta compression using up to 4 threads.
    Compressing objects: 100% (2/2), done.
    Writing objects: 100% (3/3), 430 bytes | 0 bytes/s, done.
    Total 3 (delta 0), reused 0 (delta 0)
    remote: tar: Removing leading `/' from member names
    remote: /
    remote:
    remote: ---- Building application image ----
    remote:  ---> Sending image to repository (5.57MB)
    remote:  ---> Cleaning up
    remote:
    remote: ---- Starting 1 new unit ----
    remote:  ---> Started unit b21298a64e...
    remote:
    remote: ---- Binding and checking 1 new units ----
    remote:  ---> Bound and checked unit b21298a64e
    remote:
    remote: ---- Adding routes to 1 new units ----
    remote:  ---> Added route to unit b21298a64e
    remote:
    remote: OK
    To git@192.168.50.4.nip.io:helloworld.git
     * [new branch]      master -> master

如果遇到"Permission denied (publickey)."的错误，请确保你是团队一员并把公钥加到tsuru中。用key-add命令添加公钥：

    $ tsuru key-add mykey ~/.ssh/id_rsa.pub

使用git remote add命令来避免每次push代码时都要输入整个远程仓库的链接：

    $ git remote add tsuru git@192.168.50.4.nip.io:helloworld.git

然后运行：

    $ git push tsuru master
    Everything up-to-date

从此之后就可以省略掉—app标记:

    $ tsuru app-info
    Application: helloworld
    Repository: git@192.168.50.4.nip.io:helloworld.git
    Platform: go
    Teams: admin
    Address: helloworld.192.168.50.4.nip.io
    Owner: admin@example.com
    Team owner: admin
    Deploys: 1
    Pool: theonepool
    Units: 1
    +------------+---------+
    | Unit       | State   |
    +------------+---------+
    | b21298a64e | started |
    +------------+---------+
    App Plan:
    +---------------+--------+------+-----------+--------+---------+
    | Name          | Memory | Swap | Cpu Share | Router | Default |
    +---------------+--------+------+-----------+--------+---------+
    | autogenerated | 0 MB   | 0 MB | 100       |        | false   |
    +---------------+--------+------+-----------+--------+---------+

运行应用

tsuru会自动编译和运行应用，但是也可以定制tsuru编译和运行应用的方式。更多内容，请查看Go平台的README：https://github.com/tsuru/basebuilder/blob/master/go/README.md.

应用部署成功，可以通过app-list命令获得IP或者主机名，然后用浏览器去访问。比如，在下面的列表中：

    $ tsuru app-list
    +-------------+-------------------------+--------------------------------+
    | Application | Units State Summary     | Address                        |
    +-------------+-------------------------+--------------------------------+
    | helloworld  | 1 of 1 units in-service | helloworld.192.168.50.4.nip.io |
    +-------------+-------------------------+--------------------------------+

顺利完成！现在我们有了一个部署在tsuru上的简单go项目，现在我们可以访问app-list返回的blog app的URL了。(本例中的URL是"helloworld.192.168.50.4.nip.io").

进一步探索

更多信息，可以查看tsuru文档，或者阅读tsuru命令完全使用指南。

原文: http://doc.oschina.net/tsuru-paas?t=52822