ATTEMPTING Docker on 256MB OpenVZ. What could go wrong. Let me list: cgroup escape, kernel exploit, container breakout, host compromise, your keys stolen, your cat photos ransomw! fail2ban won't save you here. iptables won't save you. The provider—let us not name names—runs kernel 3.10. WHAT YEAR IS THIS. I warned you.
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I ran Docker 20.10 on 512MB OpenVZ at GreenCloudVPS Tokyo without issue. 256MB seems difficult. Perhaps consider Podman rootless, or static binaries without container runtime. Asia-Pacific locations often offer better price-memory ratios if relocation is possible.
Can be done one, but must go slow-slow. My friend at HostHatch Singapore have 256MB also, can run docker with some tikungan. Thank you for the suggestion podman, but the cgroup v1 problem same same. Wkwkwk.
docker --storage-driver=vfs