CentOS 7の癖

Linux
  • バージョン確認
# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
  • IP系コマンド
net-tools iproute2
ifconfig ip a(addr), ip l(link)
route ip r(route)
netstat ss
netstat -i ip -s l(link)
arp ip n(neighbor) 
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno16777736: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:91:79:a2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.9.3/24 brd 192.168.9.255 scope global dynamic eno16777736
       valid_lft 59998887sec preferred_lft 59998887sec
    inet6 2400:4010:427:3109:20c:29ff:fe91:79a2/64 scope global noprefixroute dynamic
       valid_lft 2591970sec preferred_lft 604770sec
    inet6 fe80::20c:29ff:fe91:79a2/64 scope link
       valid_lft forever preferred_lft forever

# ip r
default via 192.168.9.1 dev eno16777736  proto static  metric 100
192.168.9.0/24 dev eno16777736  proto kernel  scope link  src 192.168.9.3  metric 100

# ss
Netid  State      Recv-Q Send-Q            Local Address:Port                             Peer Address:Port
u_str  ESTAB      0      0                             * 19019                                       * 19018
u_str  ESTAB      0      0                             * 19033                                       * 19032
u_str  ESTAB      0      0                             * 19025                                       * 19026
u_str  ESTAB      0      0      /var/run/dbus/system_bus_socket 17510                                * 17509         
u_str  ESTAB      0      0                             * 19062                                       * 19063
u_str  ESTAB      0      0                             * 19045                                       * 19044
u_str  ESTAB      0      0                             * 18352                                       * 18353
u_str  ESTAB      0      0                             * 19083                                       * 19084
u_str  ESTAB      0      0                             * 18249                                       * 18250
u_str  ESTAB      0      0      /var/run/dbus/system_bus_socket 16772                                * 16771

# ip n
fe80::b60c:25ff:fe1e:213 dev eno16777736 lladdr b4:0c:25:1e:02:13 router STALE
192.168.9.1 dev eno16777736 lladdr b4:0c:25:1e:02:13 STALE
192.168.9.2 dev eno16777736 lladdr f0:de:f1:e2:76:f6 REACHABLE
  • IPの変更(スタティックとDHCPを切り替えるとき)
# nmtui

・ネットワークリスタート
# systemctl restart NetworkManager
# service network restart
Restarting network (via systemctl):

(参考)
RHEL7/CentOS7でipコマンドをマスター
NetworkManagerの設定変更、nmtuiとnmcliについてまとめたよ！
CentOS7 ネットワークの設定変更