jenkins + supervisor + ansible 实现netcore程序的多机一键部署 - 好文

　　

　　上一篇我们简单的说到了使用jenkins+supervisor实现了一个单机版的多副本部署，但是在更多的场景下还是需要netcore程序的多机一键部署，那么多

机器间如何分发呢？肯定不能使用scp这么低级别的命令，所以你的技术栈中要引进ansible，用它来实现这个功能不要太爽。

　　

一：ansible部署

ansible是一个自动化运维工具，实现方法就是在主控机上通过ssh免秘钥的方式自动分发你的程序到多台机器上，所以第一步你要配置主控机到远程机

的ssh免秘钥登陆。我这里有两台机器：

  10.25.198.96 【主控机】

10.25.59.59 【远程机】

大概的一个简图就是这样。

1. 免密登陆
[root@localhost ~]# ssh-keygen -t rsa -P '' Generating public/private rsa key
pair. Enter filein which to save the key (/root/.ssh/id_rsa): Created directory
'/root/.ssh'. Your identification has been saved in /root/.ssh/id_rsa. Your
public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: 40:
72:cc:f4:c3:e7:15:c9:9f:ee:f8:48:ec:22:be:a1 root@localhost.localdomain The key'
s randomart image is: +--[ RSA 2048]----+ | .++ ... | | +oo o. | | . + . .. . |
| . + . o | | S . . | | . . | | . oo | | ....o... | | E.oo .o.. |
+-----------------+ [root@localhost ~]# ls /root/.ssh/id_rsa /root/.ssh/id_rsa
[root@localhost~]# ls /root/.ssh id_rsa id_rsa.pub [root@localhost ~]# scp
/root/.ssh/id_rsa.pub root@10.25.59.59:/root/.ssh/authorized_keys root@10.25.
59.59's password: id_rsa.pub 100% 408 0.4KB/s 00:00 [root@localhost ~]# cat
/root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

2. 安装ansible

因为ansible是python写的，通常有两种安装方式：yum 和 pip install 。
我这里就采用yum安装，安装完成之后，直接键入ansible命令如下：
[root@localhost ~]# ansible ERROR! Unexpected Exception, this is probably a
bug: (cryptography0.8.2 (/usr/lib64/python2.7/site-packages), Requirement.parse(
'cryptography>=1.1')) the full traceback was:

可以看到上面报错了，如果你不了解python，还是有点头疼的，上面说的是你的cryptography包版本太低，需要安装>=1.1的，你可以到pipy上down一个

新包下来。 https://pypi.org/project/cryptography/2.5/
<https://pypi.org/project/cryptography/2.5/%20>

对了，如果你的pip也没装的话，那你还是先通过yum install pip吧。
[root@localhost ~]# pip install cryptography==2.5 DEPRECATION: Python 2.7 will
reach the end of its life on January 1st,2020. Please upgrade your Python as
Python2.7 won't be maintained after that date. A future version of pip will
drop support for Python 2.7. Collecting cryptography==2.5 Downloading https://
files.pythonhosted.org/packages/17/fd/4c2c8953a9dfe38fbe0c3adafb6355540bd98cef70cc82734acb0a4c0e2f/cryptography-2.5-cp27-cp27mu-manylinux1_x86_64.whl
(2.4MB) 100% |████████████████████████████████| 2.4MB 14kB/s Collecting cffi!=
1.11.3,>=1.8 (from cryptography==2.5) Downloading https://
files.pythonhosted.org/packages/14/dd/3e7a1e1280e7d767bd3fa15791759c91ec19058ebe31217fe66f3e9a8c49/cffi-1.11.5-cp27-cp27mu-manylinux1_x86_64.whl
(407kB) 100% |████████████████████████████████| 409kB 15kB/s Requirement
already satisfied: six>=1.4.1 in /usr/lib/python2.7/site-packages (from
cryptography==2.5) (1.9.0) Collecting ipaddress; python_version < "3" (from
cryptography==2.5) Downloading https://
files.pythonhosted.org/packages/fc/d0/7fc3a811e011d4b388be48a0e381db8d990042df54aa4ef4599a31d39853/ipaddress-1.0.22-py2.py3-none-any.whl
Collecting asn1crypto>=0.21.0 (from cryptography==2.5) Downloading https://
files.pythonhosted.org/packages/ea/cd/35485615f45f30a510576f1a56d1e0a7ad7bd8ab5ed7cdc600ef7cd06222/asn1crypto-0.24.0-py2.py3-none-any.whl
(101kB) 100% |████████████████████████████████| 102kB 34kB/s Requirement
already satisfied: enum34; python_version< "3" in /usr/lib/python2.7
/site-packages (from cryptography==2.5) (1.0.4) Requirement already satisfied:
pycparserin /usr/lib/python2.7/site-packages (from cffi!=1.11.3,>=1.8
->cryptography==2.5) (2.14) Installing collected packages: cffi, ipaddress,
asn1crypto, cryptography Found existing installation: cffi0.8.6 Uninstalling
cffi-0.8.6: Successfully uninstalled cffi-0.8.6 Found existing installation:
cryptography0.8.2 Uninstalling cryptography-0.8.2: Successfully uninstalled
cryptography-0.8.2 Successfully installed asn1crypto-0.24.0 cffi-1.11.5
cryptography-2.5 ipaddress-1.0.22

再输入ansbile如果没有报错那就恭喜你搞定了，否则的话还是迭代循环吧。
[root@localhost ~]# ansible Usage: ansible <host-pattern> [options] Define and
run a single task'playbook' against a set of hosts

3. ansible简单介绍

安装好了ansible之后，在/etc/ansible目录下会有三个文件，如下：
[root@localhost ~]# cd /etc/ansible [root@localhost ansible]# ls ansible.cfg
hosts roles

《1》 ansible.cfg

这个是ansible自身的config文件，默认就这样，我们暂不管。

《2》 hosts

这里面配置的就是ansible要操控的远程机器，比如我在末尾加上的10.25.59.59 和 10.25.198.96 两台我要分发的机器。
# This is the default ansible 'hosts' file. # # It should live in /etc/ansible/
hosts # #- Comments begin with the '#' character # - Blank lines are ignored # -
Groups of hosts are delimited by [header] elements #- You can enter hostnames
or ip addresses #- A hostname/ip can be a member of multiple groups # Ex 1:
Ungrouped hosts, specify before any group headers. ## green.example.com ##
blue.example.com ##192.168.100.1 ## 192.168.100.10 # Ex 2: A collection of
hosts belonging to the'webservers' group ## [webservers] ## alpha.example.org
## beta.example.org ##192.168.1.100 ## 192.168.1.110 # If you have multiple
hosts following a pattern you can specify # them like this: ## www[001:006
].example.com # Ex3: A collection of database servers in the 'dbservers' group
## [dbservers] ## ## db01.intranet.mydomain.net ## db02.intranet.mydomain.net ##
10.25.1.56 ## 10.25.1.57 # Here's another example of host ranges, this time
there are no # leading 0s: ## db-[99:101]-node.example.com [memsql-test]
10.25.59.59 10.25.198.96

《3》 roles

一般来说ansible推荐都是以role模板格式作为playbook来实现非常强大的功能，比如这个地方：
https://galaxy.ansible.com/ <https://galaxy.ansible.com/> 都是一些供你学习的role模板。

4. 编写playbook

《1》 deploy.yaml
--- - hosts: all remote_user: root vars: inifile: "memsql-test" program: "
MemSql.Test" workspace: "/var/lib/jenkins/workspace/{{ program
}}/MemSql.NetCore/{{ program }}/bin/Release/netcoreapp2.1/publish/" tasks: -
name:1. directory publish files copy: src: "{{ workspace }}" dest: "
/data/output/{{ program }}" - name: 2. copy *.ini file for supervisor copy: src:
"{{ workspace }}/doc/{{ inifile }}.ini" dest: /data/supervisor/conf/ - name: 3.
supervisordfile supervisorctl: name: memsql-test state: restarted
supervisorctl_path:/usr/bin/supervisorctl config:
/data/supervisor/supervisord.conf

这个配置文件大概是什么意思呢？

《1》 hosts： memsql-test 表示要操作memsql-test组下的所有主机，还记得你在hosts中配置的ip地址吗？

《2》 remote_user: root   告诉你远程操控的角色是什么。

《3》 vars   定义一些变量，方便后面少些一些重复的代码。

《4》 tasks：   定义一些按顺序执行的Action

《5》 name：某一个action动作的描述

copy： copy命令，这个算是ansible的模块了，具体参见：
https://docs.ansible.com/ansible/latest/modules/copy_module.html
<https://docs.ansible.com/ansible/latest/modules/copy_module.html?highlight=copy>

  supervisorctl：这个ansible集成了supervisor，挺好的，具体参见：
https://docs.ansible.com/ansible/latest/modules/supervisorctl_module.html
<https://docs.ansible.com/ansible/latest/modules/supervisorctl_module.html>

三：ansible 和 jenkins 集成

  在我的doc文件夹下有三个文件，方便jenkins在脚本执行的时候获取相关文件。

《1》 deploy.yaml 这个就是上面介绍的

《2》 entrypoint.sh 这个脚本是准备copy到jenkins的command命令框中
cd ./MemSql.NetCore/MemSql.Test \ && dotnet publish -c Release \ &&
ansible-playbook ./doc/deploy.yaml
《3》 memsql-test.ini   如果看过上一篇，那这个就不介绍了
[program:memsql-test] command=/usr/bin/dotnet /data/output/MemSql.Test/
MemSql.Test.dll autostart=false autorestart=true stdout_logfile
=/data/output/MemSql.Test/1.log 　　
《4》最后就是一个简单的program.cs
class Program { static void Main(string[] args) { var cts = new
CancellationTokenSource();var bgtask = Task.Run(() => { for (int i = 0; i < int
.MaxValue; i++) { Log.Info($"当前index={i}, 时间为:{DateTime.Now}"); Thread.Sleep(new
Random().Next(1000, 3000)); } }); Log.Info($"{DateTime.Now} Test 后端服务程序正常启动！"
); Console.WriteLine($"{DateTime.Now} Test 后端服务程序正常启动！"); bgtask.Wait(); } }

《5》在jenkins中执行一下，当然你也可以使用jenkins的ansible插件，简单的话用脚本也可以。

点击jenkins构建之后，就可以看到console界面中 playbook的脚本在跑了。

然后你到两台机器都验证一起，process可是起来了。
[root@10-25-59-59 ~]# ps -ef | grep dotnet root 22949 1371 0 11:28 ? 00:00:01
/usr/bin/dotnet /data/output/MemSql.Test/MemSql.Test.dll root 26337 18477 0 11:
45 pts/0 00:00:00 grep --color=auto dotnet [root@10-25-198-96 ~]# ps -ef | grep
dotnet root4831 21660 6 11:45 ? 00:00:00 /usr/bin/dotnet
/data/output/MemSql.Test/MemSql.Test.dll

好了，本篇就说到这里，希望对你有帮助。

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