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hetzner migration.md
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# Tweet Migration from Digital Ocean to Hetzner, covering about 120 servers (20 db, 80 task, 20 app)
"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." ## 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 maintenance_on
make celery_stop make celery_stop
```
# Postgres ## Postgres
# Edit postgres/consul_service.json: db-postgres2 -> hdb-postgres-1 > Edit postgres/consul_service.json: db-postgres2 -> hdb-postgres-1
```
aps -l db-postgres2,hdb-postgres-1,hdb-postgres-2 -t consul aps -l db-postgres2,hdb-postgres-1,hdb-postgres-2 -t consul
aps -l hdb-postgres-1 -t pg_promote aps -l hdb-postgres-1 -t pg_promote
```
# Mongo ## Mongo
```
sshdo db-mongo-primary1 sshdo db-mongo-primary1
sudo docker exec -it mongo mongo sudo docker exec -it mongo mongo
rs.config() rs.config()
rs.reconfig() rs.reconfig()
```
# Move mongo analytics ## Mongo analytics
# Edit mongo/tasks/main.yml: mongo_analytics_secondary
> Edit mongo/tasks/main.yml: mongo_analytics_secondary
```
aps -l db-mongo-analytics2,hdb-mongo-analytics-1 -t consul aps -l db-mongo-analytics2,hdb-mongo-analytics-1 -t consul
```
# Redis ## Redis
# Edit redis/tasks/main.yml: redis_secondary > 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-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-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-story-1,hdb-redis-story-2,db-redis-story1 -t consul
aps -l hdb-redis-pubsub,db-redis-pubsub -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 apd -l hdb-redis-user-1,hdb-redis-session-1,hdb-redis-story-1,hdb-redis-pubsub -t replicaofnoone
```
# Elasticsearch ## Elasticsearch
# Edit elasticsearch/tasks/main.yml: elasticsearch_secondary > Edit elasticsearch/tasks/main.yml: elasticsearch_secondary
```
aps -l db-elasticsearch1,hdb-elasticsearch-1 -t consul aps -l db-elasticsearch1,hdb-elasticsearch-1 -t consul
# Eventually MUserSearch.remove_all() ```
> Eventually `MUserSearch.remove_all()`
# Test hwww.newsblur.com ## Test hwww.newsblur.com
```
ansible-playbook ansible/deploy.yml -l happ-web-01 --tags maintenance_off ansible-playbook ansible/deploy.yml -l happ-web-01 --tags maintenance_off
```
# Looks good? Launch ## Looks good? Launch
# Haproxy on DO to redirect to Hetzner
> Haproxy on DO to redirect to Hetzner
```
aps -l www -t haproxy aps -l www -t haproxy
# Change DNS to point to Hetzner ```
> Change DNS to point to Hetzner
```
make maintenance_off make maintenance_off
```
# Setup redis replicas (replica.conf port)