iptables -I INPUT 1 -i eth0 -p tcp –dport 80 -m state –state NEW,ESTABLISHED -j ACCEPT

 iptables -nvL

• -L 表示查看当前表的所有规则，默认查看的是 filter 表，如果要查看 nat 表，可以加上 -t nat 参数。
• -n 表示不对 IP 地址进行反查，加上这个参数显 …

2.1. Java Version Numbers

For reference, let’s take a quick look at the Java version numbers. This will come in handy in case we need to download the appropriate Java version.

The major and …

fatal: [10.2.1.199]: UNREACHABLE! => {“changed”: false, “msg”: “Failed to connect to the host via ssh: Host key verification failed.”, “unreachable”: …

安装

参考 https://pkg.jenkins.io/redhat-stable/

sudo wget -O /etc/yum.repos.d/jenkins.repo \
    https://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import …

curl ifconfig.io

curl ifconfig.me

curl ipinfo.io/ip/