docker—tomcat 报错：Failed to get D-Bus connection: Operation not permitted

docker search centos   查系统镜像

docker pull docker.io/centos

进入容器

[root@git opt]# docker images
REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE
docker.io/tomcat8                  latest              37e6b19c14e0        25 hours ago        517 MB
gitalb-zh                          latest              dd61a1ec3cdc        2 days ago          1.72 GB
docker.io/twang2218/gitlab-ce-zh   latest              1f71f185271a        11 days ago         1.63 GB
docker.io/centos                   latest              2d194b392dd1        2 weeks ago         195 MB

docker run -it docker.io/centos /bin/bash

安装tomcat

yum -y install tomcat......
代码路径： /usr/share/tomcat/webapps/ROOT/index.jsp
配置文件路径： /usr/share/tomcat/

把装好tomcat容器，生成镜像

[root@git opt]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                   NAMES
a9717660d785        docker.io/tomcat8   "/usr/sbin/init"    About an hour ago   Up About an hour    0.0.0.0:888->8080/tcp   tomcat8
[root@git opt]# docker commit a9717660d785 docker.io/tomcat8

用新镜像生成容器进行访问

[root@git opt]# docker images
REPOSITORY                         TAG                 IMAGE ID            CREATED             SIZE
docker.io/tomcat8                  latest              37e6b19c14e0        26 hours ago        517 MB
gitalb-zh                          latest              dd61a1ec3cdc        2 days ago          1.72 GB
docker.io/twang2218/gitlab-ce-zh   latest              1f71f185271a        11 days ago         1.63 GB
docker.io/centos                   latest              2d194b392dd1        2 weeks ago         195 MB

docker run -itd -p 888:8080 --privileged=true --name tomcat8 docker.io/tomcat8 /usr/sbin/init   （注：参数-d 是后台运行）

结尾如果 /bin/bash 进入容器后无法启动服务，报错：Failed to get D-Bus connection: Operation not permitted
据说是centos7的BUG
所以这里需 /usr/sbin/init   进入容器后可以使用systemctl 命令  
因为这样会把宿主机的dbus服务带入容器启动

[root@a9717660d785 /]# ps -ef 
UID         PID   PPID  C STIME TTY          TIME CMD
root          1      0  0 07:38 ?        00:00:00 /usr/sbin/init
root         17      1  0 07:38 ?        00:00:00 /usr/lib/systemd/systemd-journald
root         27      1  0 07:38 ?        00:00:00 /usr/sbin/sshd -D
dbus         28      1  0 07:38 ?        00:00:00 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
root         29      1  0 07:38 ?        00:00:00 /usr/lib/systemd/systemd-logind

如果想进入：

[root@git opt]# docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                   NAMES
a9717660d785        docker.io/tomcat8   "/usr/sbin/init"    About an hour ago   Up About an hour    0.0.0.0:888->8080/tcp   tomcat8
[root@git opt]# docker exec -it a9717660d785 bash

访问看效果：