Enterprise Linux 7 new feature_network configuration

Copyright 2016 All Right Reversed Nobreak Co.,LTD. Reproduction is strictly PROHIBITED

Enterprise Linkx 7 New FeatureRHEL , OEL , CentOS , Fedora

Suk Kim , Oracle ACE Director

Nobreak Senior managed Consultant


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( , , )

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Contacts : [email protected]

NetworkManager nmcli , network manager


( nick : )

) ( Oracle ACE Director )

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Network Configuration


ifconfig route /etc/sysconfig/network-scripts/ifcfg-ethX service NetworkManager .

/etc/hosts /etc/resolv.conf /etc/hostname /etc/sysconfig/network /etc/sysconfig/network-scripts/ifcfg-ethX #service network stop | start | restart chkconfig [--level ] [--type ]

# system-config-network netstat -nr route


Service ( NetworkManager ) NM_CONTROLLED=no

[root@el7 ~]# systemctl enable network.servicenetwork.service is not a native service, redirecting to /sbin/chkconfig.Executing /sbin/chkconfig network onThe unit files have no [Install] section. They are not meant to be enabledusing systemctl.Possible reasons for having this kind of units are:1) A unit may be statically enabled by being symlinked from another unit's

.wants/ or .requires/ directory.2) A unit's purpose may be to act as a helper for some other unit which has

a requirement dependency on it.3) A unit may be started when needed via activation (socket, path, timer,

D-Bus, udev, scripted systemctl call, ...).[root@el7 ~]# systemctl restart network.service[root@el7 ~]# systemctl stop NetworkManager.service[root@el7 ~]# systemctl disable NetworkManager.servicerm '/etc/systemd/system/multi-user.target.wants/NetworkManager.service'rm '/etc/systemd/system/dbus-org.freedesktop.NetworkManager.service'rm '/etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service'


network manager

[root@el7 ~]# yum -y install NetworkManager


network manager

[root@el7 ~]# systemctl status NetworkManager

[root@el7 ~]# systemctl start NetworkManager

[root@el7 ~]# systemctl enable NetworkManager


RHEL7 / OEL 7 1.

[root@el7 /]# ip addr

1: lo: 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

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: eno16777736: mtu 1500 qdisc pfifo_faststate UP qlen 1000 link/ether 00:0c:29:21:a6:95 brd ff:ff:ff:ff:ff:ff

3: virbr0: mtu 1500 qdisc noqueue state DOWN link/ether 82:51:91:6a:74:61 brd ff:ff:ff:ff:ff:ff

inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0

ethX ???

en:Etherneto : on board

http://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-net_id.c#n20


RHEL7 / OEL 7 2. grub

[root@el7 ~]# vi /etc/default/grub

GRUB_TIMEOUT=5

GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

GRUB_DEFAULT=saved

GRUB_DISABLE_SUBMENU=true

GRUB_TERMINAL_OUTPUT="console"

GRUB_CMDLINE_LINUX="vconsole.font=latarcyrheb-sun16 vconsole.keymap=konet.ifnames=0 biosdevname=0 rd.lvm.lv=ol/root crashkernel=auto rd.lvm.lv=ol/swap rhgb quiet"

GRUB_DISABLE_RECOVERY="true

3.grub.cfg

[root@el7 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg


RHEL7 / OEL 7

4.grub.cfg

[root@el7 /]# vi /boot/grub2/grub.cfg


RHEL7 / OEL 7 5.

cf. .

[root@el7 ~]# mv /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0

6. [root@el7 ~]# reboot

7. [root@el7 ~]# ip addr

1: lo: 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

inet6 ::1/128 scope host


2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000

link/ether 00:0c:29:21:a6:95 brd ff:ff:ff:ff:ff:ff


()

ip

[root@el7 /]# ip addr show eth02: eth0: mtu 1500 qdisc pfifo_faststate U

link/ether 00:0c:29:4e:c3:93 brd ff:ff:ff:ff:ff:ffinet 192.168.102.131/24 brd 192.168.102.255 scope global eth0inet6 fe80::20c:29ff:fe4e:c393/64 scope link


( ip )

[root@el7 /]# ip -s link show eth02: eth0: mtu 1500 qdisc pfifo_fast state U

link/ether 00:0c:29:4e:c3:93 brd ff:ff:ff:ff:ff:ffRX: bytes packets errors dropped overrun mcast128395 1424 0 0 0 0 TX: bytes packets errors dropped carrier collsns127536 1000 0 0 0 0


()

ip

[root@el7 ~]# ip addr add 10.0.2.50/16 dev eth0

ip

[root@el7 ~]# ip addr


( )

[root@el7 /]# ip routedefault via 192.168.102.2 dev eth0 proto static metric 1024 192.168.102.0/24 dev eth0 proto kernel scope link src 192.168.102.131 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1

# ip route [ add | del | change | append | replace ] destination-address

[root@el7 /]# ip route add default via 192.168.1.1

[root@el7 /]# route add -net default gw 10.0.2.2 dev eth0

ipv6

[root@el7 /]# ip -6 route add 2001::/24 via 2001:db0::3


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[root@el7 ~]# netstat -nr

main

[root@el7 ~]# ip route show table main


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[root@el7 ~]# ip route show table all


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( ip )

[root@el7 /]# ping -c 3 192.168.102.2PING 192.168.102.2 (192.168.102.2) 56(84) bytes of data.64 bytes from 192.168.102.2: icmp_seq=1 ttl=128 time=0.179 ms64 bytes from 192.168.102.2: icmp_seq=2 ttl=128 time=0.210 ms64 bytes from 192.168.102.2: icmp_seq=3 ttl=128 time=0.196 ms

--- 192.168.102.2 ping statistics ---3 packets transmitted, 3 received, 0% packet loss, time 2001msrtt min/avg/max/mdev = 0.179/0.195/0.210/0.012 ms


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traceroute

[root@el7 /]# traceroute www.naver.comtraceroute to www.naver.com (125.209.222.142), 30 hops max, 60 byte packets1 192.168.102.2 (192.168.102.2) 2.238 ms 2.058 ms 1.960 ms2 * * *[root@el7 /]# traceroute -T www.naver.comtraceroute to www.naver.com (125.209.222.141), 30 hops max, 60 byte packets1 192.168.102.2 (192.168.102.2) 0.698 ms 0.544 ms 0.415 ms2 125.209.222.141 (125.209.222.141) 21.358 ms 21.326 ms 21.066 ms

tracepath

[root@el7 /]# tracepath www.redhat.com1: 192.168.102.131 0.130ms pmtu 15001: 192.168.102.2 0.577ms 1: 192.168.102.2 0.609ms


(, )

netstat

[root@el7 /]# netstat -anpActive Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 2376/dnsmasqtcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1109/sshdtcp 0 0 0.0.0.0:56569 0.0.0.0:* LISTEN 1125/rpc.statdtcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1102/rpcbindtcp6 0 0 :::22 :::* LISTEN 1109/sshd

ss command

[root@el7 /]# ss -taState Recv-Q Send-Q Local Address:Port Peer Address:PortLISTEN 0 5 192.168.122.1:domain *:* LISTEN 0 128 *:ssh *:* LISTEN 0 128 *:56569 *:* LISTEN 0 128 *:sunrpc *:* ESTAB 0 0 192.168.102.131:ssh 192.168.102.1:52138 LISTEN 0 128 :::ssh :::* LISTEN 0 128 :::42019 :::* LISTEN 0 128 :::sunrpc :::*


ss command

listening TCP

[root@el7 /]#ss -t -l

UDP

[root@el7 /]#ss -u -a

SSH

[root@el7 /]#ss -o state established '( dport = :ssh or sport = :ssh )'

X

[root@el7 /]#ss -x src /tmp/.X11-unix/*

(http , https) FIN-WAIT-1 , 193.233.7/24

[root@el7 /]#ss -o state fin-wait-1 '( sport = :http or sport = :https )' dst 193.233.7/24


nmcli

( --active : )

[root@el7 ~]# nmcli connection show


nmcli

( connection ID(name) )

[root@el7 ~]# nmcli connection show "eno16777736"

nm-settings(5)


nmcli

[root@el7 ~]# nmcli dev status

[root@el7 ~]# nmcli dev show eth0


nmcli connection

default (DHCP )

[root@el7 ~]# nmcli connection add con-name "default" type ethernet ifnameeth0 Connection 'default' (3ee33144-5540-4ff8-9b54-511d0237fd67) successfully added.

static ( , )

[root@el7 ~]# nmcli connection add con-name "static" ifname eth0 autoconnectno type ethernet ip4 192.168.102.20 gw4 192.168.102.2Connection 'static' (5833257b-738c-4505-ba29-cecac9771793) successfully added.

static

[root@el7 ~]# nmcli connection up "static"

DHCP

[root@el7 ~]# nmcli connection up default"

nmcli dev disconnect DEVNAME

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nmcli type option

wifi type ssid

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nmcli connection

static

[root@el7 ~]# nmcli connection show "static" connection.id: staticconnection.uuid: e461fe3c-6666-4fd3-a7d5-3f1c9d366f51connection.interface-name: eth0


nmcli connection

autoconnect off

[root@el7 ~]# nmcli connection modify "static" connection.autoconnect no

DNS

[root@el7 ~]# nmcli connection modify "static" ipv4.dns 168.126.63.1[root@el7 ~]# nmcli connection modify "static" +ipv4.dns 8.8.8.8

ip gateway

[root@el7 ~]# nmcli connection modify "static" ipv4.addresses "192.168.102.30/24 192.168.102.2"

ip

[root@el7 ~]# nmcli connection modify "static" +ipv4.addresses "10.0.2.20/16"

nmcli con mod (configuration file) ,. nmcli con up static .


[root@el7 network-scripts]# vi /etc/sysconfig/network-scripts/ifcfg-eth0

[root@el7 ~]# nmcli connection reload

[root@el7 ~]# nmcli connection down "static"

[root@el7 ~]# nmcli connection up "static"

Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/8)

reload network manager


network manager-gui

[root@el7 ~]# nm-connection-editor


network manager-tui

[root@el7 ~]# nmtui


GUI


nmcli command summarycommand

nmcli dev status

nmcli con show

nmcli con up

nmcli con down , autoconnect .

nmcli dev dis autoconnect

nmcli net off

nmcli con add .

nmcli con mod

nmcli con del

1 Network Configuration network manager network manager RHEL7 / OEL 7 RHEL7 / OEL 7 RHEL7 / OEL 7 RHEL7 / OEL 7 () () ( ) ( ) ( ) ( ) ( ) (, )ss command nmcli nmcli nmcli nmcli connection nmcli type optionnmcli connection nmcli connection network manager-guinetwork manager-tui GUInmcli command summary

Engineering

Enterprise Linux 7 new feature_network configuration