Linux Red Hat 7 and derived distributions have removed and deprecated few commands. Among them netstat and lsof, which are popular between DBAs.
This post shows how to obtain the network information in compliance with the new OS commands.
NETSTAT
netstat – is now considered obsolete, and it has been replaced by ss:
root@oel7qa01:~$ ss -t State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 0 192.168.1.117:54360 192.0.78.23:https ESTAB 0 0 192.168.1.117:48538 198.252.206.25:https ESTAB 0 0 192.168.1.117:42744 162.125.18.133:https ESTAB 0 0 127.0.0.1:38106 127.0.0.1:52828 ESTAB 0 0 192.168.1.117:54008 192.0.78.23:https CLOSE-WAIT 1 0 192.168.1.117:60054 51.2xx.195.xx:https ESTAB 0 0 192.168.1.117:47904 198.2xx.202.xx:https CLOSE-WAIT 32 0 192.168.1.117:56724 108.1xx.172.xxx:https CLOSE-WAIT 32 0 192.168.1.117:47050 54.xx.201.xxx:https ESTAB 0 0 127.0.0.1:52828 127.0.0.1:38106 CLOSE-WAIT 32 0 192.168.1.117:44728 108.1xx.xxx.6x:https ESTAB 0 0 192.168.1.117:41848 195.xxx.2xx.xxx:https ESTAB 0 0 192.168.7.50:41268 192.168.7.60:ssh ESTAB 0 0 2a02:1203:ecb0:7b80:58d9:f6e5:90d9:f266:53060 2a00:1450:400e:800::2003:https ESTAB 0 0 2a02:1203:ecb0:7b80:58d9:f6e5:90d9:f266:37978 2a00:1450:400a:804::200e:https ESTAB 0 0 2a02:1203:ecb0:7b80:58d9:f6e5:90d9:f266:51682 2a00:1450:400a:804::2003:https
The netstat -r information is now provided by the command ip route:
--Until Red Hat 6 [root@oel7node00 ~]# netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default gateway 0.0.0.0 UG 0 0 0 enp0s8 default gateway 0.0.0.0 UG 0 0 0 enp0s3 10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s3 172.31.100.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s9 192.168.7.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s8 192.168.200.0 0.0.0.0 255.255.255.0 U 0 0 0 enp0s10 --As of Red Hat 7 [root@oel7node00 ~]# ip route default via 192.168.7.50 dev enp0s8 proto static metric 100 default via 10.0.2.2 dev enp0s3 proto static metric 101 10.0.2.0/24 dev enp0s3 proto kernel scope link src 10.0.2.15 metric 100 172.31.100.0/24 dev enp0s9 proto kernel scope link src 172.31.100.10 metric 100 192.168.7.0/24 dev enp0s8 proto kernel scope link src 192.168.7.60 metric 100 192.168.200.0/24 dev enp0s10 proto kernel scope link src 192.168.200.10 metric 100
The netstat -i information is now provided by the command ip route:
--Until Red Hat 6 [root@oel7node00 ~]# netstat -i Kernel Interface table Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg enp0s3 1500 66 0 0 0 72 0 0 0 BMRU enp0s8 1500 1201 0 0 0 687 0 0 0 BMRU enp0s9 1500 2 0 0 0 2 0 0 0 BMRU enp0s10 1500 2 0 0 0 7 0 0 0 BMRU lo 65536 0 0 0 0 0 0 0 0 LRU --As of Red Hat 7 [root@oel7node00 ~]# ip -s link 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 RX: bytes packets errors dropped overrun mcast 0 0 0 0 0 0 TX: bytes packets errors dropped carrier collsns 0 0 0 0 0 0 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 08:00:27:4c:63:1b brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 5860 66 0 0 0 0 TX: bytes packets errors dropped carrier collsns 5662 72 0 0 0 0 3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 08:00:27:2b:ca:66 brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 131645 1237 0 0 0 0 TX: bytes packets errors dropped carrier collsns 223396 704 0 0 0 0 4: enp0s9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 08:00:27:cc:fb:2e brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 120 2 0 0 0 0 TX: bytes packets errors dropped carrier collsns 120 2 0 0 0 0 5: enp0s10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 08:00:27:6f:7e:47 brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 120 2 0 0 0 0 TX: bytes packets errors dropped carrier collsns 558 7 0 0 0 0
The netstat -g information is now provided by the command ip maddr:
--Until Red Hat 6 [root@oel7node00 ~]# netstat -g IPv6/IPv4 Group Memberships Interface RefCnt Group --------------- ------ --------------------- lo 1 all-systems.mcast.net enp0s3 1 all-systems.mcast.net enp0s8 1 all-systems.mcast.net enp0s9 1 all-systems.mcast.net enp0s10 1 all-systems.mcast.net lo 1 ff02::1 lo 1 ff01::1 enp0s3 1 ff02::1 enp0s3 1 ff01::1 enp0s8 1 ff02::1 enp0s8 1 ff01::1 enp0s9 1 ff02::1 enp0s9 1 ff01::1 enp0s10 1 ff02::1 enp0s10 1 ff01::1 --As of Red Hat 7 [root@oel7node00 ~]# ip maddr 1: lo inet 224.0.0.1 inet6 ff02::1 inet6 ff01::1 2: enp0s3 link 01:00:5e:00:00:01 inet 224.0.0.1 inet6 ff02::1 inet6 ff01::1 3: enp0s8 link 01:00:5e:00:00:01 inet 224.0.0.1 inet6 ff02::1 inet6 ff01::1 4: enp0s9 link 01:00:5e:00:00:01 inet 224.0.0.1 inet6 ff02::1 inet6 ff01::1 5: enp0s10 link 01:00:5e:00:00:01 inet 224.0.0.1 inet6 ff02::1 inet6 ff01::1
LSOF
lsof is no longer included on the OS minimal installation, but not considered as obsolete or deprecated, therefore simply use yun to intall the missing package:
[root@oel7node00 ~]# which lsof /usr/bin/which: no lsof in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin) [root@oel7node00 ~]# yum install lsof Loaded plugins: ulninfo Resolving Dependencies --> Running transaction check ---> Package lsof.x86_64 0:4.87-4.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ========================================================================================================================================================= Package Arch Version Repository Size ========================================================================================================================================================= Installing: lsof x86_64 4.87-4.el7 ol7_latest 330 k Transaction Summary ========================================================================================================================================================= Install 1 Package Total download size: 330 k Installed size: 927 k Is this ok [y/d/N]: y Downloading packages: Delta RPMs disabled because /usr/bin/applydeltarpm not installed. lsof-4.87-4.el7.x86_64.rpm | 330 kB 00:00:00 Running transaction check Running transaction test Transaction test succeeded Running transaction Installing : lsof-4.87-4.el7.x86_64 1/1 Verifying : lsof-4.87-4.el7.x86_64 1/1 Installed: lsof.x86_64 0:4.87-4.el7 Complete!
My Oracle Notes 