NewsBlur/hetzner migration.md

Tweet

"Time for a big server transition. I’m moving the servers from Digital Ocean to Hetzner. Every database server (postgresql, mongo, redis x 4, elasticsearch, prometheus, consul, and sentry) is making the move. I’m going to do it all at once, which means about an hour of downtime."

"Afterwards, you shouldn't notice anything different, although these are bare metal servers, so theoretically they should be faster and more reliable."

Postgres

Edit postgres/consul_service.json: db-postgres2 -> hdb-postgres-1

aps -l db-postgres2,hdb-postgres-1,hdb-postgres-2 -t consul aps -l hdb-postgres-1 -t pg_promote

Mongo

sshdo db-mongo-primary1 sudo exec -it mongo mongo rs.config() rs.reconfig()

Move mongo analytics

Edit mongo/tasks/main.yml: mongo_analytics_secondary

aps -l db-mongo-analytics,hdb-mongo-analytics -t consul

Redis

Edit redis/tasks/main.yml: redis_secondary

aps -l hdb-redis-user-1,hdb-redis-user-2 -t redis aps -l hdb-redis-session-1,hdb-redis-session-2 -t redis aps -l hdb-redis-story-1,hdb-redis-story-2 -t redis aps -l hdb-redis-pubsub -t redis

Go into each redis and SLAVEOF NO ONE

Elasticsearch

Edit elasticsearch/tasks/main.yml: elasticsearch_secondary

aps -l hdb-elasticsearch-1 -t elasticsearch

Eventually MUserSearch.remove_all()

Haproxy on DO to redirect to Hetzner

aps -l www -t haproxy

Change DNS to point to Hetzner