运行第一个容器

admin

环境准备好了，马上运行第一个容器，执行如下命令：
   docker run -d -p 80:80 httpd
8 a+ I/ H9 H% Y2 G6 l
# w9 |1 f4 v) @; |运行结果如下过程：
Unable to find image 'httpd:latest' locally
* t" f; z/ v- f( }7 ]0 P. Z$ Dlatest: Pulling from library/httpd
4176fe04cefe: Pull complete
d6c01cf91b98: Pull complete
b7066921647a: Pull complete
643378aaba88: Pull complete
3c51f6dc6a3b: Pull complete
4f25e420c4cc: Pull complete
ccdbe37da15c: Pull complete
Digest: sha256:5a73586de6429d7ffbf8de990c82a0027c676eb1e438bbe7f9307d2cf285ee37
; l& l6 ]# Z% x! s$ Q7 Q" nStatus: Downloaded newer image for httpd:latest
2da567ec704b670b041b1eb0195c0312d29732baee2e6e06b3645d1f28f0f720
/ a" {1 X8 F( @( L* d

admin

报错内容：Failed to get D-Bus connection: Operation not permitted。

; v7 `; F5 K  @+ w5 u! S/ v3 O报这个错的原因是dbus-daemon没能启动。systemctl并不是不能使用。将CMD或者entrypoint设置为/usr/sbin/init即可。docker容器会自动将dbus等服务启动起来。如下：
docker run --privileged -ti --name test  docker.io/centos:7  /usr/sbin/init
( C5 a, ~3 f7 e* ^2 `
# docker run --privileged -ti --name centos7.2 docker.io/centos:7 /usr/sbin/init
Unable to find image 'centos:7' locally
7: Pulling from library/centos
7dc0dca2b151: Pull complete
0 E2 t( |. Z1 g+ H: x7 R" ]3 dDigest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
* d# Q- B- ]; K( KStatus: Downloaded newer image for centos:7
! |4 P5 K$ J/ D. [
9 E! c2 H3 \, r& K! d4 ]# 在创建docker容器时添加--privileged
docker run --privileged  -ti -e "container=docker"  -v /sys/fs/cgroup:/sys/fs/cgroup  centos  /usr/sbin/init
& C" r- `, h3 W* P# w% f$ D- ?

admin

# docker run --privileged -ti  docker.io/centos:7 /usr/sbin/init
Unable to find image 'centos:7' locally
7: Pulling from library/centos
7dc0dca2b151: Pull complete
Digest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
Status: Downloaded newer image for centos:7