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04-Troubleshooting.md

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TROUBLESHOOTING

  • In this lecture we will be going to troubleshooting the issue that Bob is facing.

  • Bob is not able to reach to the repository server and he get the error as show below.

    site

Check Interfaces

  • Use the ip link to ensure the primary interface is up.

  • In this case, the network interface named enp1s0f1 state is up.

    [~]$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc
    noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp1s0f1: <BROADCAST,BROADCAST,MULTICAST,UP> mtu 1500 qdisc
    fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 08:97:98:6e:55:4d brd ff:ff:ff:ff:ff:ff

  • Check if we can resolve the hostname to IP address via nslookup

    [~]$ nslookup caleston-repo-01
Server:      192.168.1.100
Address:     192.168.1.100 #53

Non-authoritative answer:
Name: caleston-repo-01
Address: 192.168.2.5

  • ping to check the connectivity.

    [~]$ ping caleston-repo-01
PING caleston-repo-01 (192.168.2.5) 56(84) bytes of data.

--- localhost ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2034ms

  • traceroute to check the number of hops between the source.

    [~]$ traceroute 192.168.2.5

Tracing route to example.com [192.168.2.5]
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 192.168.1.1
2 <2 ms <1 ms <1 ms 192.168.2.1
3 * * * Request timed out.

  • To check the port status use netstat command and to use it along with port number use below command.

    [caleston-repo-01: ~]$ netstat -an | grep 80 | grep -i LISTEN

    net

  • To bring up the interface up use below command.

    [caleston-repo-01: ~]$ ip link set dev enp1s0f1 up

    iplink