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CentOS7でのiptablesの設定忘れるのでメモ

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毎回毎回調べるのも苦痛になってきたので、ここいらでメモ残しとく。

firewalldは全然つつけてないのと、つい見慣れてるiptablesのほうを使ってしまうんです。。。

firewalldを停止

command
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld

iptablesのインストール

無ければインストールする

command
yum -y install iptables-services

iptablesの起動と自動起動の設定

command
systemctl start iptables
systemctl enable iptables
systemctl status iptables

iptablesの設定

vi /etc/sysconfig/iptables

iptables
*filter
:INPUT   DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT  ACCEPT [0:0]
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
# SSH
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
# httpd
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
# httpd ssl
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

SSHのポートを変更したら、SSHDのコンフィグも設定変更すること。
これを地味に忘れてて、1時間もハマってしまったので

vi /etc/ssh/sshd_config

sshd_config
#Port 22 ← コメントアウトを解除
Port 22

ポート番号変更したらsshdのリロードを行う

command
systemctl reload sshd

ちょっとしたサーバー立てた時に設定覚えてないの。

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