如何获取在机器上启动的单元的IP地址，并在另一个机组中使用它？ [英] How can I get the IP address of a unit started on a machine and use it in another unit with fleet?

问题描述

我是新的CoreOS和Docker，我正面临着车队的问题。

我有一个标准的单位启动一个POSTGRES容器，我想了解启动本机的机器的IP地址。
我实际上是一组3台机器，POSTGRES单元并不总是在同一台机器上启动（这意味着IP不是静态的）。

当我开始另一个单元（见下文）需要POSTGRES时，需要它。

我正在使用单位参数称为BindsTo：

  [单位] 
描述=测试
之后= docker.service 
 After=[e-mail] 
 
要求= docker.service 
 Requires = [e-mail] 
 
 BindsTo=[e-mail] 
 
 [服务] 
 TimeoutStartSec = 0 
 ExecStartPre =  -  / usr / bin / docker kill test％i 
 ExecStartPre =  -  / usr / bin / docker rm test％i 
 ExecStart = / usr / bin / docker run -rm --name test％i -e HOST =HereThePostgresIPsryther / test 
 ExecStop = / usr / bin / docker stop test％i 
  

NB ：该单位不需要在与POSTGRES单元相同的机器上启动。

我尝试使用％H变量，但是它返回主机名，而不是机器的IP地址。

Flannel也用于我的集群。

谢谢

---

我发现了一种解决方法：

  [单位] 
描述=测试
后= docker.service 
 
要求= docker.service 
 
 [服务] 
 TimeoutStartSec = 0 
 ExecStartPre =  -  / usr / bin / docker kill test％i 
 ExecStartPre =  -  / usr / bin / docker rm test％i 
 
 ExecStart = / usr / bin / docker run -rm --name test％i --link postgres1：postgres sryther / test 
 ExecStop = / usr / bin / docker stop test％i 
  

并且IP地址在容器环境中设置为 POSTGRES_PORT_5432_TCP_ADDR 。

解决方案

根据Greg我使用了SkyDNS和注册人：

我正在使用注册商在我的车队环境中发现。当我启动我的车队时，我修改云配置文件，还包括注册商（以及etcd，法兰绒，车队等）。登记员在码头营地营地，并识别何时新的集装箱启动/停止/停止。注册管理员管理已发现的容器的数据库，它具有多种口味（如领事，skydns）。我配置我的运行在skydns模式。

下面你可以找到我的工作云配置，请记住，我正在使用CoreOS 607和我的测试在VMware上执行。我的目标是设置3台机器，使一个小型集群在每台机器上运行，如这个。

我设法找到了这个解决方案，感谢Greg关于这个话题和与Vagrant一​​起使用的云配置文件。

我希望它会帮助：）

---

  cloud-config 
 
 coreos：
 etcd：
发现：https://discovery.etcd.io/4c8c3f9a67048e76e9075c97d9d63c0c 
 addr：192.168.1.13:4001 
 peer-addr：192.168.1.13:7001 
 fleet：
 public-ip：192.168.1.13 
 units：
  -  name：etcd.service 
 command：start 
  - 名称：flanneld.service 
 drop-ins：
  - 名称：50-network-config.conf 
 content：| 
 [服务] 
 ExecStartPre = / usr / bin / etcdctl set /coreos.com/network/config'{网络：172.16.0.0/16}'
命令：start 
  - 名称：fleet.service 
命令：start 
  - 名称：skydns.service 
 enable：false 
 content：| 
 [单位] 
描述= Skydns 
 After = docker.service 
 After = fleet.service 
 [服务] 
 ExecStartPre = / usr / bin / docker pull skynetservices / skydns 
 ExecStart = / usr / bin / env bash -c'/ usr / bin / docker run -p 53:53 --name skydns -e ETCD_MACHINES =http：// $（ifconfig docker0 | awk \'/ \< inet\> / {print $ 2} \'）：4001skynetservices / skydns -nameservers =8.8.8.8:53--addr =0.0.0.0:53 '
 ExecStop = / usr / bin / docker stop skydns 
 Restart = always 
 
 [X-Fleet] 
 Global = true 
 
 [Install] 
 WantedBy = multiuser.target 
  -  name：registrator.service 
 enable：false 
 content：| 
 [单位] 
描述=注册人
 After = docker.service 
 After = fleet.service 
 
 [服务] 
 ExecStartPre = usr / bin / docker pull gliderlabs / registrator 
 ExecStart = / usr / bin / env bash -c'/ usr / bin / docker run --net = host -p 8080：8080 -p 8443：8443 -v / var / run / docker.sock：/tmp/docker.sock --name注册器gliderlabs / registrator skydns2：// $（ifconfig docker0 | awk \'/ \< inet\> / {print $ 2} \\ \\'）：4001 / skydns.local'
 ExecStop = / usr / bin / docker stop registrator 
重新启动=总是
 
 [X-Fleet] 
全局= true 
  -  name：primordial.service 
命令：start 
 content：| 
 [单位] 
说明=加载和启动车队服务
后= fleet.service 
要求= fleet.service 
后= etcd.service 
要求= etcd.service 
 After = flanneld.service 
 Requires = flanneld.service 
 
 [服务] 
 Type = oneshot 
 RemainAfterExit = yes 
 ExecStartPre = / usr / bin / systemctl stop docker.service 
 ExecStartPre = / usr / bin / ifconfig docker0 down 
 ExecStartPre = / usr / bin / brctl delbr docker0 
 ExecStartPre = / usr / bin / systemctl start docker.service 
 ExecStart = / usr / bin / fleetctl start /etc/systemd/system/skydns.service 
 ExecStart = / usr / bin / fleetctl start / etc / systemd / system / registrator.service 
 ssh_authorized_keys：
  -  ssh-rsa AAAA .... 
  

I'm new to CoreOS and Docker and I'm facing with a problem with fleet.

I have a standard unit launching a POSTGRES container and I would like to know the IP address of the machine where this unit is started. I have actually a cluster of 3 machines and the POSTGRES unit isn't always started on the same machine (which means the IP is not static).

I need it when I start another unit (see below), which needs a POSTGRES.

I'm using at the moment the Unit Parameter called BindsTo :

[Unit]
Description=Test
After=docker.service
After=[e-mail]

Requires=docker.service
Requires=[e-mail]

BindsTo=[e-mail]

[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill test%i
ExecStartPre=-/usr/bin/docker rm test%i
ExecStart=/usr/bin/docker run -rm --name test%i -e HOST="HereThePostgresIP" sryther/test
ExecStop=/usr/bin/docker stop test%i

N.B. : This unit doesn't need to be started on the same machine as the POSTGRES unit.

I tried with %H variable but it returns the hostname and not the IP address of the machine.

Flannel is also used in my cluster.

Thanks!

---

I found a workaround :

[Unit]
Description=Test
After=docker.service

Requires=docker.service

[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill test%i
ExecStartPre=-/usr/bin/docker rm test%i

ExecStart=/usr/bin/docker run -rm --name test%i --link postgres1:postgres sryther/test
ExecStop=/usr/bin/docker stop test%i

And the IP address is set in the container environment as POSTGRES_PORT_5432_TCP_ADDR.

解决方案

According to Greg I used SkyDNS and Registrator :

I am using registrator for discovery in my fleet environment. When I start up my fleet I modify the cloud-config file to also include registrator (along with etcd, flannel, fleet, etc). Registrator camps on docker and recognizes when new containers are started/killed/stop. Registrator manages a database of discovered containers, it does so in several flavors (like consul, skydns). I configure mine to run in skydns mode.

Below you can find my working cloud-config, keep in mind that I'm using CoreOS 607 and my tests are performed on VMware. My goal was to set up 3 machines to make a small cluster with one etcd running on each machine like this.

I managed to found this solution thanks to Greg on this topic and with this cloud-config file used with Vagrant.

I hope it'll help :)

---

#cloud-config

coreos:
  etcd:
    discovery: https://discovery.etcd.io/4c8c3f9a67048e76e9075c97d9d63c0c
    addr: 192.168.1.13:4001
    peer-addr: 192.168.1.13:7001
  fleet:
    public-ip: 192.168.1.13
  units:
    - name: etcd.service
      command: start
    - name: flanneld.service
      drop-ins:
        - name: 50-network-config.conf
          content: |
            [Service]
            ExecStartPre=/usr/bin/etcdctl set /coreos.com/network/config '{ "Network": "172.16.0.0/16" }'
      command: start
    - name: fleet.service
      command: start
    - name: skydns.service
      enable: false
      content: |
        [Unit]
        Description=Skydns
        After=docker.service
        After=fleet.service
        [Service]
        ExecStartPre=/usr/bin/docker pull skynetservices/skydns
        ExecStart=/usr/bin/env bash -c '/usr/bin/docker run -p 53:53 --name skydns -e ETCD_MACHINES="http://$(ifconfig docker0 | awk \'/\<inet\>/ { print $2}\'):4001" skynetservices/skydns -nameservers="8.8.8.8:53" --addr="0.0.0.0:53"'
        ExecStop=/usr/bin/docker stop skydns
        Restart=always

        [X-Fleet]
        Global=true

        [Install]
        WantedBy=multi-user.target
    - name: registrator.service
      enable: false
      content: |
        [Unit]
        Description=Registrator
        After=docker.service
        After=fleet.service

        [Service]
        ExecStartPre=/usr/bin/docker pull gliderlabs/registrator
        ExecStart=/usr/bin/env bash -c '/usr/bin/docker run --net=host -p 8080:8080 -p 8443:8443 -v /var/run/docker.sock:/tmp/docker.sock --name registrator gliderlabs/registrator skydns2://$(ifconfig docker0 | awk \'/\<inet\>/ { print $2}\'):4001/skydns.local'
        ExecStop=/usr/bin/docker stop registrator
        Restart=always

        [X-Fleet]
        Global=true
    - name: primordial.service
      command: start
      content: |
        [Unit]
        Description=Load and start fleet services
        After=fleet.service
        Requires=fleet.service
        After=etcd.service
        Requires=etcd.service
        After=flanneld.service
        Requires=flanneld.service

        [Service]
        Type=oneshot
        RemainAfterExit=yes
        ExecStartPre=/usr/bin/systemctl stop docker.service
        ExecStartPre=/usr/bin/ifconfig docker0 down
        ExecStartPre=/usr/bin/brctl delbr docker0
        ExecStartPre=/usr/bin/systemctl start docker.service
        ExecStart=/usr/bin/fleetctl start /etc/systemd/system/skydns.service
        ExecStart=/usr/bin/fleetctl start /etc/systemd/system/registrator.service
ssh_authorized_keys:
  - ssh-rsa AAAA....

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