如果在 docker 容器中，安装了 openssh-server，启动的时候会提示没有权限，是因为需要 docker 使用 --privileged 来启动容器，如果没有 privileged 权限，可以尝试使用 service 来启动

# docker run --rm -it centos:7.2.1511 bash
yum install openssh-server -y -q
yum install initscripts -y -q
ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
systemctl disable sshd
cat > /etc/init.d/sshd << "EOF"
#!/bin/bash
#
# sshd: OpenSSH Server daemon
#
# description: The sshd daemon is the server process for ssh
#

# Source function library.
. /etc/init.d/functions

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

# Make sshd pid file directory if not exists
mkdir -p /var/run/sshd

# OpenSSH daemon options
OPTIONS="-f /etc/ssh/sshd_config"

# Read environment variables file
if [ -f /etc/sysconfig/sshd ] ; then
        . /etc/sysconfig/sshd
fi

# Start or stop daemon
case "$1" in
  start)
        echo -n $"Starting sshd daemon: "
        daemon /usr/sbin/sshd $OPTIONS
        echo
        ;;
  stop)
        echo -n $"Stopping sshd daemon: "
        killproc /usr/sbin/sshd
        echo
        ;;
  restart)
        $0 stop
        sleep 1
        $0 start
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart}"
        exit 2
esac

exit $?
EOF
chmod +x /etc/init.d/sshd
service sshd start