I am using *Capistrano 2.15.5* to deploy *Java *web applications to *Tomcat*
application servers. For the time being, we are tied and committed to this
version of Capistrano and we cannot upgrade to v3. The deploy task will
call on the other tasks to get executed in parallel on all servers in the
role. This works as expected and has been working well for a while.
Now we need to implement a *Rolling Deployment* when the tasks are executed
on one server at a time. So, based on the code below, we would execute
shutdown_tomcat,
download_bits, deploy_bits, start_tomcat on prdapp01 first and then prdapp02
and
so on... So that only one server in the cluster is offline at any given
time, thus maximizing our up-time.
What is the best way to implement this *Rolling Deployment* strategy with
Capistrano?
This is what a paired-down version of my Capistrano script looks like
currently:
task :production do
role :app, "deployuser@prdapp01", "deployuser@prdapp02",
"deployuser@prdapp03"
# ...
end
task :deploy do
shutdown_tomcat
download_bits
deploy_bits
start_tomcat
end
task :shutdown_tomcat, :roles => :app do
run "sudo /sbin/service tomcat stop || exit 1;"
end
task :download_bits, :roles => :app do
run <<-EOS
[ -f /tmp/app_download ] && rm -rf /tmp/app_download;
mkdir -p /tmp/app_download;
cd /tmp/app_download;
wget -q https://internal.server/path/to/application.war || exit 1;
EOS
end
task :deploy_bits, :roles => :app do
run <<-EOS
cd /tmp/app_download;
unzip -q -o /tmp/app_download/application.war -d /usr/local/tomcat/
webapps/ || exit 1;
exit 0;
EOS
end
task :start_tomcat, :roles => :app do
run "sudo /sbin/service tomcat start || exit 1;"
end
Then I run ...
$ cap -f deploy.cap production deploy
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