Ensure that /proc/sys/net is writable
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Works around failure of Docker to create containers (moby/moby#47769)— level=error msg="Cannot disable IPv6 on container interface." error="open /proc/sys/net/ipv6/conf/eth0/disable_ipv6: read-only file system" interface=eth0 —as suggested in the Docker Engine 27.0.1 release notes.
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Docker fails to create containers when
/proc/sys/netis read-only:The Docker 27.0.1 release notes suggest three workarounds:
This had no effect; Docker still attempted to write into
/proc/sys/net, needlessly.This is possible since we’re already using
CAP_SYS_ADMIN.This caused Dokku’s nginx configurations to become invalid, as they listen on IPv6 by default.