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docker doesn't use sysctl values from host

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I run a linux container on oraclelinux 9 linux host (the host itself runs in a VM). From where does docker read the sysctl params? I try change the default value of a sysctl value which docker uses. For that I executed the following steps on the host - sysctl -w net.ip4.udp_rmem_min=64000000 - sysctl -a | grep ip4.udp_rmem_min -> 64000000 - systemctl restart docker (just to be save) - docker run --rm -it oraclelinux:9 in container - sysctl -a | grep ip4.udp_rmem_min -> 4096 Why is it 4096 and not 64000000? cat /proc/sys/net/ipv4/udp_rmem_min on the host does return 64000000 I also copied a file containing the parameters to /etc/sysctl.d/ and rebooted the machine, same result. Interestingly when I do the same on a Ubuntu 22 machine (bare metal), it works. So from where does docker read the sysctl values in oraclelinux 9/rhel? I assumed it just uses the one from the host or do I have some other issues? I know I could use --sysctl with docker run, but I can't use it like that because I use docker indirectly through kind which doesn't seem to provide any possibility to define --sysctl
Asked by Arikael (185 rep)
Apr 5, 2024, 07:58 AM