Stack Sizer

1. Mattermost docs: Software and hardware requirements (PostgreSQL 14.0+; v12.0 needs 15+; single server 1–1,000 users: 1 vCPU, 2 GB RAM; 1,000–2,000: 2 vCPU, 4 GB) (Mattermost, read 14 Oct 2026)
2. Mattermost docs: Scale up to 200 users (app node 2 vCPU/4 GiB; files 1–5, 5–25 or 25–100 MB per user per month; start from 600–800 MB) (Mattermost, read 14 Oct 2026)
3. mattermost repository: model/config.go at v11.7.12 (ListenAddress :8065, SiteURL http://localhost:8065, MaxOpenConns 100, MaxUsersPerTeam 50, EnableOpenServer false, socket in /var/tmp) (Mattermost, read 14 Oct 2026)
4. Docker Hub manifest of mattermost/mattermost-team-edition:11.7.12 (linux/amd64): 448,271,026 B compressed; 31 layers decompressed and counted: 649,274,368 B (Mattermost, read 14 Oct 2026)
5. Docker: the containerd image store keeps image layers both compressed and uncompressed (Mattermost, read 14 Oct 2026)
6. PostgreSQL 18 documentation: 19.4 Resource Consumption (Mattermost, read 10 Oct 2026)
7. PostgreSQL 18 documentation: 19.3 Connections and Authentication (Mattermost, read 10 Oct 2026)
8. PostgreSQL 18 documentation: 19.10 Vacuuming (autovacuum settings) (Mattermost, read 10 Oct 2026)
9. PostgreSQL 18 documentation: 19.5 Write Ahead Log (max_wal_size) (Mattermost, read 10 Oct 2026)
10. PostgreSQL 18 documentation: 51.2 How Connections Are Established (Mattermost, read 10 Oct 2026)
11. Docker Official Image postgres: documentation (docker-library/docs) (Mattermost, read 10 Oct 2026)
12. Docker Hub: library/postgres tag 18.6 (compressed image sizes) (Mattermost, read 10 Oct 2026)
13. Mattermost docs: Important upgrade notes (v11.0: MySQL ended, PostgreSQL 14+, Bleve and GitLab SSO in Team Edition removed, PBKDF2 hashing, MaxOpenConns 100; v10.11.17+ to ≤ v11.7.2 blocked) (Mattermost, read 14 Oct 2026)
14. Ubuntu Server: System requirements (Sizing policy, read 10 Oct 2026)
15. Google Kubernetes Engine: About GKE node sizing (Sizing policy, read 10 Oct 2026)
16. ANAROQ measurement: dockerd and containerd at rest (Ubuntu 24.04, Docker 29.8.2) (Sizing policy, read 10 Oct 2026)
17. Docker Community Forums: Docker resource usage & overhead (Sizing policy, read 10 Oct 2026)
18. journald.conf(5), Ubuntu Manpages (Sizing policy, read 10 Oct 2026)
19. Docker Docs: Local file logging driver (Sizing policy, read 10 Oct 2026)
20. AWS Compute Optimizer: Rightsizing recommendation preferences (Sizing policy, read 10 Oct 2026)
21. Kubernetes: Node-pressure Eviction (Sizing policy, read 10 Oct 2026)
22. mke2fs(8), Ubuntu Manpages (Sizing policy, read 10 Oct 2026)

Catalog release

2026.10.10

Sizing policy

2026.10.0

Profile Mattermost

1.0.0

How the numbers are built