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Docker的CentOS镜像由于做了精简，去掉了 ping 命令，那我们该如何安装这个命令呢
首先可以用 yum provides 命令来搜索哪个软件包里包含了 ping 命令
[root@a7128460b671 /]# yum provides "*/ping"
Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
* base: mirrors.cn99.com
* extras: mirrors.cn99.com
* updates: mirrors.cn99.com
base | 3.7 kB 00:00
base/primary_db | 4.7 MB 00:01
extras | 3.4 kB 00:00
extras/primary_db | 29 kB 00:00
updates | 3.4 kB 00:00
updates/primary_db | 5.3 MB 00:01
base/filelists_db | 6.4 MB 00:01
extras/filelists_db | 25 kB 00:00
updates/filelists_db | 3.2 MB 00:00
pacemaker-cli-1.1.15-5.el6.x86_64 : Command line tools for controlling Pacemaker clusters
Repo : base
Matched from:
Filename : /usr/lib/ocf/resource.d/pacemaker/ping
irssi-0.8.15-5.el6.x86_64 : Modular text mode IRC client with Perl scripting
Repo : base
Matched from:
Filename : /usr/share/irssi/help/ping
iputils-20071127-24.el6.x86_64 : Network monitoring tools including ping
Repo : base
Matched from:
Filename : /bin/ping
1:qt-examples-4.6.2-28.el6_5.x86_64 : Programming examples for qt
Repo : base
Matched from:
Filename : /usr/lib64/qt4/examples/dbus/pingpong/ping
可以看到好几个软件包都包含这个命令，但 iputils 最像是我们要找的，安装它
[root@a7128460b671 /]# yum install iputils
.......
[root@a7128460b671 /]# ping 114.114.114.114
PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.
64 bytes from 114.114.114.114: icmp_seq=1 ttl=65 time=8.28 ms
64 bytes from 114.114.114.114: icmp_seq=2 ttl=84 time=9.25 ms
64 bytes from 114.114.114.114: icmp_seq=3 ttl=63 time=7.69 ms
64 bytes from 114.114.114.114: icmp_seq=4 ttl=63 time=8.43 ms
64 bytes from 114.114.114.114: icmp_seq=5 ttl=63 time=10.2 ms