Capistrano 3:仅在分配了角色的服务器池中的单个服务器上运行任务 [英] Capistrano 3: Run task only on a single server from a pool of servers assigned a role
问题描述
我有20台处于网络角色的服务器。由于更改会影响共享存储,因此我只需要对其中一项执行任务。我当前的解决方案是解决此问题的方法(如下)。寻找更好的方法,我没有大量的红宝石或制帽经验。
I have 20 servers that are in the "web" role. I have a task I need to perform on only one of them as the change affects shared storage. My current solution is a hack to get around this (below). Looking for a better way, I don't have a ton of ruby or cap experience.
task :checkout_project_properties do
num_runs = 0
on roles(:web), in: :sequence do
if num_runs > 0
abort('Only running on one server. Exiting')
end
execute("checkout-project-properties #{uc_stage} #{repo} #{branch}")
num_runs += 1
end
end
推荐答案
我假设您是指具有这么多Web服务器的生产配置。在这种情况下,您的 config / deploy / production.rb
可能包含许多这样的行:
I assume that you are referring to your production configuration, with so many web servers. In this case, your config/deploy/production.rb
probably contains many lines like this:
server 'web_1', roles: %w(web)
server 'web_2', roles: %w(web)
server 'web_3', roles: %w(web)
...
只需将其中一台服务器设置为主服务器,因此看起来像这样:
Simply make one of these servers primary, so it looks like:
server 'web_1', roles: %w(web), primary: true
server 'web_2', roles: %w(web)
server 'web_3', roles: %w(web)
...
然后更改您的任务,使其看起来像这样:
Then change your task so it looks like this:
task :checkout_project_properties do
on primary(:web) do
execute("checkout-project-properties #{uc_stage} #{repo} #{branch}")
end
end
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