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."

make maintenance_on
make celery_stop

# 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 docker exec -it mongo mongo
rs.config()
rs.reconfig()

# Move mongo analytics
# Edit mongo/tasks/main.yml: mongo_analytics_secondary
aps -l db-mongo-analytics2,hdb-mongo-analytics-1 -t consul

# Redis

# Edit redis/tasks/main.yml: redis_secondary
aps -l hdb-redis-user-1,hdb-redis-user-2,db-redis-user -t consul
aps -l hdb-redis-session-1,hdb-redis-session-2,db-redis-sessions -t consul
aps -l hdb-redis-story-1,hdb-redis-story-2,db-redis-story1 -t consul
aps -l hdb-redis-pubsub,db-redis-pubsub -t consul
apd -l hdb-redis-user-1,hdb-redis-session-1,hdb-redis-story-1,hdb-redis-pubsub -t replicaofnoone

# Elasticsearch

# Edit elasticsearch/tasks/main.yml: elasticsearch_secondary
aps -l db-elasticsearch1,hdb-elasticsearch-1 -t consul
# Eventually MUserSearch.remove_all()

# Test hwww.newsblur.com
ansible-playbook ansible/deploy.yml -l happ-web-01 --tags maintenance_off

# Looks good? Launch
# Haproxy on DO to redirect to Hetzner
aps -l www -t haproxy
# Change DNS to point to Hetzner
make maintenance_off