rails 启动问题记录

1…error: version in “./docker-compose.yml” is unsupported. you might be seeing this error because you’re using the wrong compose file version. either specify a supported version

我看了下我的docker是20以上的，这个version:3.7 应该能够编译，后面发现挂钩的是 docker-compose(版本）1.17 .要不降version,要不升级compose

docker-compose 版本不匹配，使用下面代码安装新的

2…docker-compose 下载慢，用这个

curl -L https://get.daocloud.io/docker/compose/releases/download/1.29.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose

$ sudo chmod +x /usr/local/bin/docker-compose
version: '3.7'
services:
  postgres:
    image: postgres:11
    env_file: .env
    volumes:
    - ./data/postgres-data:/var/lib/postgresql/data
    ports:
    - "5432:5432"
  redis:
    image: redis:5.0.7
    ports:
      - "6379:6379"

3…An error occurred while installing pg (1.2.3), and Bundler cannot continue.

可能没安装 “ sudo apt-get install libpq-dev“”

4…LoadError: cannot load such file – rexml/document

rexml 不再内置，需要自己添加 gemfile 添加：gem ‘rexml’

5…https://mrzou.github.io/ruby-sidekiq（sidekiq）

使用sidekiq 需要 内置数据库 redis

6…pg,redis需要注意的几个文件
配置文件:

1. sidekiq.rb
2. docker-compose.yml
3. .env
4. .env.development.local
5. datebase.yml

7…在启动pg,redis中出现错误：
could not translate host name “postgres” to address: Name or service not known

在不确定具体原因的情况下：
datebase.yml 中所有的 “配置名称”全部手写；
要于.env中的username,password 要一样 host ：127.0.0.1

default: &default
  adapter: postgresql
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 20 } %>
  timeout: 30000
  encoding: unicode
  # username: <%= ENV['POSTGRES_USER'] %>
  # password: <%= ENV['POSTGRES_PASSWORD'] %>
  # host: <%= ENV['POSTGRES_HOST'] %>
  # port: <%= ENV['POSTGRES_PORT'] %>


  username: postgres
  password: postgres
  host: 127.0.0.1
  port: 5432

development:
  <<: *default
  database: wreeto_dev

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: wreeto_test

production:
  <<: *default
  database: wreeto_db

8…Redis::CannotConnectError: Error connecting to Redis on redis:6379 (SocketError)
改成下面这样：

require 'sidekiq'
require 'sidekiq-status'

Sidekiq.configure_client do |config|
  config.redis = { url: (ENV["REDIS_URL"] || 'redis://127.0.0.1:6379/0') }
  # accepts :expiration (optional)
  Sidekiq::Status.configure_client_middleware config, expiration: 30.minutes
end

Sidekiq.configure_server do |config|
  config.redis = { url: (ENV["REDIS_URL"] || 'redis://127.0.0.1:6379/0') }

  # accepts :expiration (optional)
  Sidekiq::Status.configure_server_middleware config, expiration: 30.minutes

  # accepts :expiration (optional)
  Sidekiq::Status.configure_client_middleware config, expiration: 30.minutes
end