chef运行资源的顺序是什么?

Question

我和厨师有一段意想不到的经历。这是:

I declare my recipe to install postgres.

execute 'sudo apt-get install postgresql-9.1 -y --force-yes'
template "/etc/postgres/9.1/main/pg_hba.conf" do
  source "pg_hba.conf.erb"
  owner "postgres"
  group "postgres"
  mode 00600
  notifies :restart, 'service[postgresql]', :immediately
  subcribes:
end
service "postgresql" do
  service_name "postgresql"
  supports :restart => true, :status => true, :reload => true
  action [:enable, :start]
end

但是当我跑向测试厨房时。

Compiling Cookbooks...
       Recipe: beesor-cookbook::postgresql
  * execute[sudo apt-get install postgresql-9.1 -y --force-yes] action run       [2014-03-14T17:37:28+00:00] INFO: Processing execute[sudo apt-get install postgresql-9.1 -y --force-yes] action run (beesor-cookbook::postgresql line 4)
Reading package lists...       
Building dependency tree...       
Reading state information...       
       postgresql-9.1 is already the newest version.
       0 upgraded, 0 newly installed, 0 to remove and 31 not upgraded.
       [2014-03-14T17:37:29+00:00] INFO: execute[sudo apt-get install postgresql-9.1 -y --force-yes] ran successfully
           - execute sudo apt-get install postgresql-9.1 -y --force-yes
Converging 3 resources       
  * execute[sudo apt-get install postgresql-9.1 -y --force-yes] action nothing[2014-03-14T17:37:29+00:00] INFO: Processing execute[sudo apt-get install postgresql-9.1 -y --force-yes] action nothing (beesor-cookbook::postgresql line 4)       
 (skipped due to action :nothing)       
  * template[/etc/postgres/9.1/main/pg_hba.conf] action create[2014-03-14T17:37:29+00:00] INFO: Processing template[/etc/postgres/9.1/main/pg_hba.conf] action create (beesor-cookbook::postgresql line 8)       
           * Parent directory /etc/postgres/9.1/main does not exist.
       ================================================================================
       Error executing action `create` on resource 'template[/etc/postgres/9.1/main/pg_hba.conf]'
       ================================================================================
       Chef::Exceptions::EnclosingDirectoryDoesNotExist
       ------------------------------------------------
       Parent directory /etc/postgres/9.1/main does not exist.
       Resource Declaration:
       ---------------------
       # In /tmp/kitchen/cookbooks/beesor-cookbook/recipes/postgresql.rb
         8: template "/etc/postgres/9.1/main/pg_hba.conf" do
         9:   source "pg_hba.conf.erb"
        10:   owner "postgres"
        11:   group "postgres"
        12:   mode 00600
        13:   notifies :restart, 'service[postgresql]', :immediately
        14: end
        15: 
       Compiled Resource:
       ------------------
       # Declared in /tmp/kitchen/cookbooks/beesor-cookbook/recipes/postgresql.rb:8:in `from_file'
       template("/etc/postgres/9.1/main/pg_hba.conf") do
         provider Chef::Provider::Template
         action "create"
         retries 0
         retry_delay 2
         path "/etc/postgres/9.1/main/pg_hba.conf"
         backup 5
         atomic_update true
         source "pg_hba.conf.erb"
         cookbook_name :"beesor-cookbook"
         recipe_name "postgresql"
         owner "postgres"
         group "postgres"
         mode 384
       end       
       [2014-03-14T17:37:29+00:00] INFO: Running queued delayed notifications before re-raising exception
       [2014-03-14T17:37:29+00:00] ERROR: Running exception handlers
       [2014-03-14T17:37:29+00:00] ERROR: Exception handlers complete
       [2014-03-14T17:37:29+00:00] FATAL: Stacktrace dumped to /tmp/kitchen/cache/chef-stacktrace.out
       Chef Client failed. 1 resources updated
       [2014-03-14T17:37:29+00:00] FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)
Converge failed on instance <postgresql-ubuntu-1204>.
Please see .kitchen/logs/postgresql-ubuntu-1204.log for more details
 ------Exception-------
Class: Kitchen::ActionFailed
Message: SSH exited (1) for command: [sudo -E chef-solo --config /tmp/kitchen/solo.rb --json-attributes /tmp/kitchen/dna.json  --log_level info]

我认为当Chef通过了recipe中的每个资源时，它会运行这些资源。

但它告诉我的恰恰相反。

厨师如何?

Answer 1

这里有几点。

首先，您粘贴的输出不是上面的配方代码。它显示了在编译期间使用action :nothing声明的资源，建议您执行以下操作:

execute 'sudo apt-get install postgresql-9.1 -y --force-yes' do
  action :nothing
end.run_action(:run)

我相信你是在试图解决你的订购问题时做的(这个问题一开始就不存在)。

第二，Chef正在做你所期望的事情，并按照它们在你的食谱中声明的顺序运行每个资源。如果您查看Converging 3 resources行之后的日志，您将看到它执行execute和action :nothing，然后是template，最后是service。

您还可以在此之前看到，它在编译期间运行execute资源，并且没有安装任何软件包，因为" postgresql-9.1 is already the newest version "(也在日志中明确说明)。

第三点，您的配方可能失败，因为postgresql-9.1包没有创建您期望的目录:" Parent directory /etc/postgres/9.1/main does not exist "。

第四，习惯的Chef安装包的方式是使用package资源:

package "postgresql-9.1" do
  action :install
end

---

我的建议:登录到你要部署这个配方的机器，确保安装了postgresql-9.1包(或者如果没有安装它)，确保这是你需要的包，然后找出pg_hba.conf文件在那个特定操作系统的位置。然后，修复您的template资源指向正确的位置。