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
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- e* @. \% ?; W- U! P' A运行结果如下过程：
2 Z. `* E2 d+ AUnable to find image 'httpd:latest' locally
  o$ t; r' i6 a6 J- F/ L: U4 a0 ulatest: Pulling from library/httpd
/ y/ a/ S1 k4 W$ F, T4176fe04cefe: Pull complete
3 Q1 V9 M7 q) q- b* r" Fd6c01cf91b98: Pull complete
b7066921647a: Pull complete
7 R" o# r; ]  d3 w% |643378aaba88: Pull complete
+ b  Z& D: R  e4 v8 w3c51f6dc6a3b: Pull complete
: J; C5 P, I, S4f25e420c4cc: Pull complete
ccdbe37da15c: Pull complete
Digest: sha256:5a73586de6429d7ffbf8de990c82a0027c676eb1e438bbe7f9307d2cf285ee37
Status: Downloaded newer image for httpd:latest
0 s7 \+ s$ W5 g- y# D  r2da567ec704b670b041b1eb0195c0312d29732baee2e6e06b3645d1f28f0f720
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admin

报错内容：Failed to get D-Bus connection: Operation not permitted。
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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：
  o* }) e4 N  {9 ^2 i" edocker run --privileged -ti --name test  docker.io/centos:7  /usr/sbin/init

' q% y% H- f& K0 ^* b! F' ^7 \( ?# docker run --privileged -ti --name centos7.2 docker.io/centos:7 /usr/sbin/init
Unable to find image 'centos:7' locally
' \  i5 B1 g3 r2 B# M$ ~) r7: Pulling from library/centos
7dc0dca2b151: Pull complete
' S" k( w2 y- dDigest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
2 D, w- i9 M0 R0 e0 TStatus: Downloaded newer image for centos:7
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1 j5 v- V9 R' Z% g5 E# 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

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
* a8 \9 c% r6 UDigest: sha256:b67d21dfe609ddacf404589e04631d90a342921e81c40aeaf3391f6717fa5322
/ _  p  B4 ?6 UStatus: Downloaded newer image for centos:7