Self-hosted Slack alternatives compared
Mattermost, Rocket.Chat, Synapse and Zulip compared on RAM, database, mobile push, SSO, upgrades and licence, using each vendor's own sizing figures.
#rocket-chat
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Self-host Rocket.Chat with Docker Compose
Self-host Rocket.Chat on a VPS with Docker Compose: the single-node MongoDB replica set it requires, TLS, backups, and every failure mode fixed.