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：
+ T/ E2 o4 r6 G' r7 @   docker run -d -p 80:80 httpd
8 b) l6 d% y$ X* v) X
运行结果如下过程：
Unable to find image 'httpd:latest' locally
latest: Pulling from library/httpd
4176fe04cefe: Pull complete
" _7 p9 ]9 e2 e% Y8 ^8 ?d6c01cf91b98: Pull complete
! y8 B8 j; v: @/ x9 u0 Yb7066921647a: Pull complete
643378aaba88: Pull complete
: c0 [. l: O+ r5 D$ W3c51f6dc6a3b: Pull complete
4f25e420c4cc: Pull complete
+ P9 f! ^% h" r2 O5 qccdbe37da15c: Pull complete
, r& G1 [% r: A% _- L+ ]3 pDigest: sha256:5a73586de6429d7ffbf8de990c82a0027c676eb1e438bbe7f9307d2cf285ee37
3 h; f" B+ E; ZStatus: Downloaded newer image for httpd:latest
. Y6 X! X' J1 V# _! f0 d2da567ec704b670b041b1eb0195c0312d29732baee2e6e06b3645d1f28f0f720

admin

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

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
$ R4 D( r5 G9 k' x
* M; Z0 ?% W; y% ^$ ]# docker run --privileged -ti --name centos7.2 docker.io/centos:7 /usr/sbin/init
Unable to find image 'centos:7' locally
1 k, a: f; N; |0 ]7: Pulling from library/centos
- g/ c5 {# M* i4 S- Z  y! z7dc0dca2b151: Pull complete
4 A1 s# k9 A7 G' O% DDigest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
Status: Downloaded newer image for centos:7

# 在创建docker容器时添加--privileged
. y$ ?) i5 a( ^docker run --privileged  -ti -e "container=docker"  -v /sys/fs/cgroup:/sys/fs/cgroup  centos  /usr/sbin/init

admin

# docker run --privileged -ti  docker.io/centos:7 /usr/sbin/init
7 }7 o7 p) y2 K7 m+ yUnable to find image 'centos:7' locally
. O( k, y: v: p7: Pulling from library/centos
7dc0dca2b151: Pull complete
0 D/ V, {$ \' mDigest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
7 n9 s" e- J. O! L, zStatus: Downloaded newer image for centos:7