docker 中 centos6.8 /etc/rc.d/init.d/functions: No such file or directory 错误，解决
rpm -qf /etc/init.d/functions
查找到
[xx@ ~]$ rpm -qf /etc/init.d/functions
initscripts-9.03.40-2.el6.centos.4.x86_64
[xx@ ~]$ rpm -qf /sbin/service
initscripts-9.03.40-2.el6.centos.4.x86_64
yum 安装即可：
yum install initscripts