Configure Discourse para usar um servidor PostgreSQL separado

Thanks

Anu reference or file need to be removed?

I needed to run development discourse (set up following Beginners Guide to Install Discourse for Development using Docker ) using database from another container. To do so, I had to modify the installation steps as follows:

  1. git clone https://github.com/discourse/discourse.git
  2. cd discourse
  3. vim config/database.yml , on the top of the file, make it into:
development:
  prepared_statements: false
  adapter: postgresql
  #database: <%= ENV['DISCOURSE_DEV_DB'] || 'discourse_development' %>
  database: discourse
  username: discourse
  password: yourdbpassword
  host: postgres
  min_messages: warning
  pool: 5
  timeout: 5000
  checkout_timeout: <%= ENV['CHECKOUT_TIMEOUT'] || 5 %>
  host_names:
    ### Don't include the port number here. Change the "port" site setting instead, at /admin/site_settings.
    ### If you change this setting you will need to
    ###   - restart sidekiq if you change this setting
    ###   - rebake all to posts using: `RAILS_ENV=production bundle exec rake posts:rebake`
    - "localhost"
  1. vim bin/docker/boot_dev, find the line starting with docker run, and add a network definition matching the docker network to which your postgres container is attached to: docker run --network my-docker_network-name -d -p 4305:...
  2. ./bin/docker/boot_dev
  3. ./bin/docker/unicorn
  4. you may need to run migrations: docker exec -it discourse_dev /bin/bash -c "cd /src; ./bin/rails db:migrate RAILS_ENV=development"
  5. visit http://localhost:9292/ and log in with credentials you set up earlier on that database

Is there a simpler way to do it, just with environment variables?

3 curtidas

This failed for me. Any suggestions on how to fix it ?
I am able to access DB discourse remotely from command line so the connection to DB looks good

FAILED
--------------------
Pups::ExecError: cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate' failed with return #<Process::Status: pid 274 exit 1>
Location of failure: /pups/lib/pups/exec_command.rb:112:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"db_migrate", "cmd"=>["su discourse -c 'bundle exec rake db:migrate'"]}
578a8ec702d0025b01a0b8396985b8bfc25c7029769c2960b58693c64609a62a
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one

I got the same error with the following lines in the log above:

rake aborted!
PG::ConnectionBad: could not connect to server: Connection refused
        Is the server running on host "127.0.0.1" and accepting
        TCP/IP connections on port 5432?

Currently I am trying to find a fix.

1 curtida

The only way for me to rebuild with external postgres was the command mentioned earlier:

 rebuild app --docker-args --net=host --skip-mac-address

But in this case unicorn is started with default port 3000. Exposing ports is disabled as well. I cannot explain exactly, but something has changed since Sep '17, probably in launcher code.

2 curtidas

Hey guys,

what´s the best practice to migrate from docker based postgre db to dedicated?
The setup of the dedicated is described farther up this thread, right, but how can I then move the data from docker to dedicated db ?
Probably with backup & restore, but is there a tutorial for that available ?

Thanks and greetings,

Julian

1 curtida

Ideally, you have discourse stopped.
Dump your database with pg_dump and restore with pg_restore.
see PostgreSQL Restore Database

Before starting up Discourse using the new database, issue as admin:

grant all privileges on database discourse to discourse;
alter schema public owner to discourse;
create extension if not exists hstore;
create extension if not exists pg_trgm;
2 curtidas

we can also use Hosts ip address instead of using --net=host
172.17.0.1 is the default address for host machine from docker network on unix machines.
Using --net=host restricts us to use -p option as docker argument.

DISCOURSE_DB_HOST = 172.17.0.1
4 curtidas

Hi,
Thank you for really great guide.
Unfortunately I got an error while reproducing it.
Initially I created discourse using launcher for all - app/redis/postgres. And it worked fine.
But with external RDS launcher failed:

root@ip-172-31-42-129:/var/discourse# ./launcher rebuild app
Ensuring launcher is up to date
Fetching origin
Launcher is up-to-date
Stopping old container
+ /usr/bin/docker stop -t 60 app
app
cd /pups && git pull && git checkout v1.0.3 && /pups/bin/pups --stdin
docker: Error response from daemon: could not get container for discourse.xxxxxxxx.us-west-2.rds.amazonaws.com: No such container: discourse.xxxxxxxx.us-west-2.rds.amazonaws.com.
See 'docker run --help'.
cat: cids/app_bootstrap.cid: No such file or directory
"docker rm" requires at least 1 argument.
See 'docker rm --help'.

Usage:  docker rm [OPTIONS] CONTAINER [CONTAINER...]

Remove one or more containers
rm: cannot remove 'cids/app_bootstrap.cid': No such file or directory
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.

Please advice how to resolve this issue.
Thank you,
Alexander K

Is there any way to pre-create and seed the database that doesn’t require going through the migration steps? We are running on AKS with external Postgres and the db setup seems to take what I consider to be an abnormally long amount of time (~8-9 minutes). Speeding this up would be great. Or is this a known issue in that configuration?

1 curtida

That’s not a supported configuration.

If you’re building an image, a bunch more stuff than just the database is getting built like a bunch of templates are getting pre-compiled. I think that’s just how long it’s going to take.

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Yes, you can bootstrap it elsewhere and then move the data to your production PostgreSQL.

However this will make updates very cumbersome.

2 curtidas

Três coisas a serem observadas.

Um: por padrão, o PostgreSQL escuta em localhost. Altere o endereço de escuta no arquivo postgresql.conf conforme mostrado abaixo.

listen_addresses = ‘localhost,172.17.0.1’

Dois: instrua o PostgreSQL a aceitar conexões de imagens do docker adicionando a seguinte linha ao arquivo pg_hba.conf.

host all all 172.17.0.0/16 scram-sha-256

Reinicie o serviço PostgreSQL após as duas alterações acima.

Três: se ainda não conseguir se conectar, verifique o firewall que pode estar bloqueando conexões de entrada na porta 5432.

2 curtidas

@Falco há algum risco de apagar tabelas existentes caso eu use um banco de dados existente?
Além disso, existe alguma forma de adicionar um prefixo para as tabelas do Discourse?

Não, a menos que entrem em conflito com os nomes do Discourse.

Mas acho que é uma má ideia.

Não. Recomendo que você use um banco de dados separado, a menos que haja algum motivo para que eles precisem ser conectados.

Que problema você está resolvendo ao compartilhar um banco de dados?

1 curtida

Obrigado, estou usando o AWS RDS, acabei de descobrir que posso ter vários bancos de dados na mesma instância, portanto, criei um novo banco de dados com um novo usuário.

2 curtidas

Tenho uma instância do Discourse recém-instalada rodando via Docker em uma VM no Google Cloud. Atualmente, tenho uploads de arquivos e backups do Discourse para buckets no Google Cloud habilitados e essas funções estão funcionando corretamente após seguir as instruções no tópico Configurar um provedor de armazenamento de objetos compatível com S3 para uploads. Posso ver os uploads de teste no bucket e, quando olho para os URLs de upload, todos os uploads estão mostrando o URL correto da CDN, então eles parecem estar sendo puxados corretamente do bucket.

Em seguida, criei uma instância PostgreSQL 15.2 no Google Cloud e executei o procedimento de configuração do banco de dados descrito no primeiro post e também configurei o arquivo app.yml. A porta padrão para PostgreSQL no Google Cloud é 5432, então omiti essas linhas.
Se eu usar o endereço IP público da instância postgres no arquivo app.yml, ao reconstruir o aplicativo, recebo o seguinte:

FAILED
--------------------
Pups::ExecError: cd /var/www/discourse & su discourse -c 'bundle exec rake db:migrate' failed with return #<Process::Status: pid 1024 exit 1>
Location of failure: /usr/local/lib/ruby/gems/3.2.0/gems/pups-1.1.1/lib/pups/exec_command.rb:117:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"db_migrate", "cmd"=>["su discourse -c 'bundle exec rake db:migrate'"]}
bootstrap failed with exit code 1
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.
a6a71b00bce378aa6334ae1c9fe103778d260bb699fe598f9685689e8b5ce450

Apenas para ver o que está acontecendo, tentei usar os outros IPs da instância postgres.
Se eu usar o endereço IP privado da instância postgres, recebo o seguinte:

FAILED
--------------------
Pups::ExecError: cd /var/www/discourse & su discourse -c 'bundle exec rake db:migrate' failed with return #<Process::Status: pid 1024 exit 1>
Location of failure: /usr/local/lib/ruby/gems/3.2.0/gems/pups-1.1.1/lib/pups/exec_command.rb:117:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"db_migrate", "cmd"=>["su discourse -c 'bundle exec rake db:migrate'"]}
bootstrap failed with exit code 1
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.
7333126c522eb51ace4d55ea89803eea54b96704baab70c322008cf2836ba47a

Se eu usar o endereço IP de saída da instância postgres, recebo o seguinte:

FAILED
--------------------
Pups::ExecError: cd /var/www/discourse & su discourse -c 'bundle exec rake db:migrate' failed with return #<Process::Status: pid 1026 exit 1>
Location of failure: /usr/local/lib/ruby/gems/3.2.0/gems/pups-1.1.1/lib/pups/exec_command.rb:117:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"db_migrate", "cmd"=>["su discourse -c 'bundle exec rake db:migrate'"]}
bootstrap failed with exit code 1
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.
c588d2b6977b9e7d493b0b59bc694369cb7c2219de67d5886112ed16312626ae

Usando todos os IPs diferentes, as mensagens de falha são muito semelhantes e o banco de dados postgres não recebe nenhum dado ou conexão. Alguém tem alguma ideia do que estou fazendo de errado?

Além disso, meu problema está sendo causado por não usar o Cloud SQL Auth Proxy na instância VM? Se estiver, acho que terei que criar um script para executar o proxy e cronometrá-lo antes da reconstrução do aplicativo. Alguém tem alguma ideia sobre isso?

Obrigado pelo tempo, pessoal.

Tentei reconstruir mais algumas vezes alternando entre os IPs e parece que o banco de dados do discourse eventualmente foi preenchido com tabelas. Então agora estou ainda mais perplexo sobre o que está acontecendo.

alguém poderia me informar para qual versão do Discourse as instruções originais foram escritas?

Deve funcionar para uma instalação padrão nos últimos 5 anos ou talvez para sempre.

Você está tendo algum problema?

1 curtida