[英]How to use not_if in a chef recipe
I am new to chef so I am a little confused in how the conditional not_if works inside a execute resource. 我是厨师的新手,所以我对条件not_if如何在执行资源中工作有点困惑。 I understand that it tells chef not to execute a command if the command returns 0 or true;
据我所知,如果命令返回0或true,它告诉厨师不要执行命令; however, in my code it is apparently still running the command.
但是,在我的代码中,它显然仍在运行命令。
The following code is supposed to create a user (and its password) and a database; 以下代码应该创建用户(及其密码)和数据库; however, if the user and database already exist, it should not do anything.
但是,如果用户和数据库已存在,则不应执行任何操作。 The user, database and password are defined in the attributes.
用户,数据库和密码在属性中定义。 The following is the code I have:
以下是我的代码:
execute "create-user" do
code = <<-EOH
psql -U postgres -c "select * from pg_user where usename='#{node[:user]}'" | grep -c #{node[:user]}
EOH
user "postgres"
command "createuser -s #{node[:user]}"
not_if code
end
execute "set-user-password" do
user "postgres"
command "psql -U postgres -d template1 -c \"ALTER USER #{node[:user]} WITH PASSWORD '#{node[:password]}';\""
end
execute "create-database" do
exists = <<-EOH
psql -U postgres -c "select * from pg_database WHERE datname='#{node[:database]}'" | grep -c #{node[:database]}}
EOH
user "postgres"
command "createdb #{node[:database]}"
not_if exists
end
Chef gives me the following error: 厨师给我以下错误:
Error executing action run
on resource 'execute[create-user]' 错误执行行动
run
资源“执行[创建用户]”
... ...
[2013-01-25T12:24:51-08:00] FATAL: Mixlib::ShellOut::ShellCommandFailed: execute[create-user] (postgresql::initialize line 16) had an error: Mixlib::ShellOut::ShellCommandFailed: Expected process to exit with [0], but received '1' [2013-01-25T12:24:51-08:00]致命:Mixlib :: ShellOut :: ShellCommandFailed:执行[create-user](postgresql :: initialize第16行)出错:Mixlib :: ShellOut :: ShellCommandFailed :预期进程以[0]退出,但收到'1'
STDERR: createuser: creation of new role failed: ERROR: role "user" already exists STDERR:createuser:新角色的创建失败:ERROR:角色“user”已存在
To me it seems that it should work;however, it still running the execute. 对我来说似乎它应该工作;但是,它仍然运行执行。 Am I missing something?
我错过了什么吗?
Thank you 谢谢
I had been having the same issue. 我一直有同样的问题。 But, in my case, "not_if" seems executed by different user (root), and failed to check the condition properly.
但是,在我的情况下,“not_if”似乎由不同的用户(root)执行,并且未能正确检查条件。 Adding [:user => "postgres"] resolved the issue.
添加[:user =>“postgres”]解决了这个问题。
execute "create-database-user" do
user "postgres"
exists = <<-EOH
psql -U postgres -c "select * from pg_user where usename='#{settings[:username]}'" | grep -c #{settings[:username]}
EOH
command "createuser -U postgres -sw #{settings[:username]}"
not_if exists, :user => "postgres"
end
I've referred the following code example. 我已经引用了以下代码示例。
https://github.com/MarcinKoziuk/chef-postgres-dbsetup/blob/master/recipes/default.rb https://github.com/MarcinKoziuk/chef-postgres-dbsetup/blob/master/recipes/default.rb
You're checking for the existence of: 你正在检查是否存在:
node[:user]
If it doesn't exist, you create: 如果它不存在,则创建:
node[:postgresql][:user]
Unless these happen to be equal, you'll keep trying to create node[:postgresql][:user] repeatedly. 除非这些恰好相同,否则你将继续尝试重复创建node [:postgresql] [:user]。
First, there is a typo in the WHERE
condition. 首先,
WHERE
条件中存在拼写错误。 It should probably be username
instead of usename
. 它可能应该是
username
而不是usename
。
Anyawy, you should do: Anyawy,你应该这样做:
execute "create-user" do
user "postgres"
command "createuser -s #{node[:user]}"
not_if "psql -U postgres -c \"select * from pg_user where username='#{node[:user]}'\" | grep -c #{node[:user]}"
end
This assumes that your psql -U postgres -c "select * from pg_user where username='#{node[:user]}'"
is correct. 这假设你的
psql -U postgres -c "select * from pg_user where username='#{node[:user]}'"
是正确的。
Same with a database: 与数据库相同:
execute "create-database" do
user "postgres"
command "createdb #{node[:database]}"
not_if "psql -U postgres -c \"select * from pg_database WHERE datname='#{node[:database]}'\" | grep -c #{node[:database]}}"
end
Regarding the username, even if it already exists, changing the password to the known one shouldn't cause a problem. 关于用户名,即使它已经存在,将密码更改为已知密码也不会导致问题。 After all you know the password.
毕竟你知道密码。
FYI, you can define multiple conditionals within one resource. 仅供参考,您可以在一个资源中定义多个条件。
Good luck with Chef! 祝大家好运! I love it very much!
我非常爱它!
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