在Docker CentOS 7容器中啓動服務

Question

我想在CentOS 7容器上啓動httpd服務。但systemctl命令在容器中不起作用。在CentOS 6中，我可以通過簡單地使用/etc/init.d/apachectl -d命令啓動httpd。但在CentOS 7中我找不到/*/systemd/中的任何apachectl文件。

那麼如何在CentOS 7容器中啓動httpd服務呢？

Answer 1

最好的辦法是讓自己的形象centos7您安裝httpd

FROM centos:7 
RUN yum -y install httpd; yum clean all; systemctl enable httpd.service 
EXPOSE 80 

建立你的形象與docker build -t my-centos:7 . Systemd沒有SYS_ADMIN不能運行。這就是爲什麼我設置了下列變量。

$ docker run -it -p 80:80 -e "container=docker" --privileged=true -d --security-opt seccomp:unconfined --cap-add=SYS_ADMIN -v /sys/fs/cgroup:/sys/fs/cgroup:ro my-centos:7 bash -c "/usr/sbin/init" 

驗證容器運行：

$ docker ps 
CONTAINER ID  IMAGE    COMMAND     CREATED    STATUS    PORTS    NAMES 
967581bdf31a  my-centos:7   "bash -c /usr/sbin/in" 1 seconds ago  Up 1 seconds  0.0.0.0:80->80/tcp gigantic_stallman 

Verifiy的httpd啓動

$ docker exec -it gigantic_stallman /bin/bash -c "systemctl status httpd" 
● httpd.service - The Apache HTTP Server 
    Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled) 
    Active: active (running) since Wed 2016-12-28 11:44:04 UTC; 2min 20s ago 
    Docs: man:httpd(8) 
      man:apachectl(8) 
Main PID: 61 (httpd) 
    Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec" 
    CGroup: /docker/967581bdf31a3b741a5e857720e199614d816b05a2132271f3adf910f0ed3207/system.slice/httpd.service 
      ├─61 /usr/sbin/httpd -DFOREGROUND 
      ├─66 /usr/sbin/httpd -DFOREGROUND 
      ├─67 /usr/sbin/httpd -DFOREGROUND 
      ├─68 /usr/sbin/httpd -DFOREGROUND 
      ├─69 /usr/sbin/httpd -DFOREGROUND 
      └─70 /usr/sbin/httpd -DFOREGROUND 

Dec 28 11:44:04 967581bdf31a systemd[1]: Starting The Apache HTTP Server... 
Dec 28 11:44:04 967581bdf31a httpd[61]: AH00558: httpd: Could not reliably d...e 
Dec 28 11:44:04 967581bdf31a systemd[1]: Started The Apache HTTP Server.