开启ssh代理服务

ssh -qTfnN -D 7070 xxx@xxx.com

# 使用安静模式
-q :- be very quite, we are acting only as a tunnel.
# 不要分配tty
-T :- Do not allocate a pseudo tty, we are only acting a tunnel.
# 后台运行
-f :- move the ssh process to background, as we don’t want to interact with this ssh session directly. 
# 不执行远程命令
-N :- Do not execute remote command. 
# 从定向输出到/dev/null
-n :- redirect standard input to /dev/null.