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I have created a small closed cluster system running on centos 7 minimal and not connected to outside. I have connected all the nodes via a switch.

On startup, node gets IP but a couple of seconds later disconnects. I struggle to make it have the IP again by restarting either the network or doing ifup enp4s0. Sometimes I repeat this process maybe for 10 minutes so that it can get the IP assigned in the following config file.

Is there a way to fix this issue so that machine can have IP automatically?

Below is the output of the ethernet interface file ifcfg-enp4s0.

TYPE="Ethernet"
PROXY_METHOD="none"
BROWSER_ONLY="no"
BOOTPROTO="none"
#DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
#IPV6INIT="yes"
#IPV6_AUTOCONF="yes"
#IPV6_DEFROUTE="yes"
#IPV6_FAILURE_FATAL="no"
#IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="enp4s0"
UUID="1fe7b71d-5b84-40af-a9e7-958188cf0d91"
DEVICE="enp4s0"
ONBOOT="yes"
IPADDR=192.168.1.105
KEY_MGMT="IEEE8021X"
#IEEE_8021X_EAP_METHODS="TTLS"
#IEEE_8021X_IDENTITY="I removed intenionally"
#IEEE_8021X_ANON_IDENTITY="I removed intenionally"
#IEEE_8021X_INNER_AUTH_METHODS="PAP"
#IPV6_PRIVACY="no"
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    You are assigning it a static ip address, one reason it would be kicked off the network, is some other device on the network had the same address. Is that the case?
    – Ramhound
    Mar 23, 2022 at 12:01
  • No, it is not the case as it is a closed system and not open to the outside world. Also, It will not have the same address with other nodes in my system because I assigned a different static IP by hand for all other nodes.
    – damian dulk
    Mar 23, 2022 at 12:03
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    Check journalctl -r and find the exact moment the issue occurs.
    – mashuptwice
    Mar 23, 2022 at 12:04
  • Any reason why you didn't define the NETMASK and GATEWAY directives?
    – nKn
    Mar 23, 2022 at 13:06
  • @nKn Not intentionally actually. The default config file does not include Netmask or Gateway lines, that's why I did not modify or add them.
    – damian dulk
    Mar 23, 2022 at 17:26

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