1.yum install openvpn 2.vi /etc/openvpn/a.openvpn client  dev tun  proto tcp remote 123.84.202.123 1194  resolv-retry infinite  #nobind persist-key  persist-tun ca /usr/local/openvpn/keys/ca.crt cert /usr/local/openvpn/keys/c4.crt  key /usr/local/openvpn/keys/c4.key  comp-lzo verb 3 mssfix 1300 tun-mtu-extra 32 3. mkdir -p /usr/local/openvpn/keys/ cd    /usr/local/openvpn/keys/ 拷貝ca與key  到當前目錄  4.啟動客戶端連線          openvpn  /etc/openvpn/a.openvpn >/dev/null & 5.ip a 檢視ip 6.測試