Hey, Two part question that I haven't been able to answer:
1) can I get the current host a task is executing on? I've read some stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me 2) if I have an array of values (let's say an array that maps ec2 host names to ec2 instance id's), can I use this same method to look up something from that array?
For example:
task :example do instanceId = lookUpTable[hostname] run "somecommand -h #{hostname} -i #{instanceid}" done
PS, the error I get when I run a task with $CAPISTRANO:HOST$ is:
* executing "echo $CAPISTRANO:HOST$" /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/server_definiti on.rb:16:in `initialize': undefined method `match' for 101:Fixnum (NoMethodError) from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:80:in `new' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:80:in `wrap_server' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:98:in `wrap_list' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:97:in `map' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:97:in `wrap_list' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:59:in `to_ary' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:74:in `concat' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/role.rb:74:in `dynamic_servers' ... 28 levels... from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/lib/capistrano/cli/execute.rb: 14:in `execute' from /usr/lib/ruby/gems/1.8/gems/capistrano-2.5.5/bin/cap:4 from /usr/bin/cap:16:in `load' from /usr/bin/cap:16
> Two part question that I haven't been able to answer:
> 1) can I get the current host a task is executing on? I've read some > stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me
I tested this task and works for me:
task :host_name do run "host $CAPISTRANO:HOST$" end
What OS are you using? Could you paste your deploy.rb in someplace(gist.github, pastie,...)?
> 2) if I have an array of values (let's say an array that maps ec2 host > names to ec2 instance id's), can I use this same method to look up > something from that array?
Capistrano uses ruby If you can do it with ruby you can do the same in a capistrano task.
Hmm. That's odd..$CAPISTRANO:HOST$ wasn't working for me on Friday. Must be
them gremlins.
Is there another variable I can use to get the current host in the ruby
code? This is what I'm trying to do:
task :bootstrap, :roles => [:master] do
# instanceids is an array containing hostname => instanceid
id = instanceids["$CAPISTRANO:HOST$"]
run "register_host -H $CAPISTRANO:HOST$ -s #{id}"
end
Obviously, $CAPISTRANO:HOST$ doesn't interpolate on the id = instanceids[]
line.
On Mon, Jul 6, 2009 at 3:31 AM, Rafael G. <r...@aspgems.com> wrote:
> Gary Richardson wrote:
> > Hey,
> > Two part question that I haven't been able to answer:
> > 1) can I get the current host a task is executing on? I've read some
> > stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me
> I tested this task and works for me:
> task :host_name do
> run "host $CAPISTRANO:HOST$"
> end
> What OS are you using? Could you paste your deploy.rb in
> someplace(gist.github, pastie,...)?
> > 2) if I have an array of values (let's say an array that maps ec2 host
> > names to ec2 instance id's), can I use this same method to look up
> > something from that array?
> Capistrano uses ruby If you can do it with ruby you can do the same in a
> capistrano task.
Richardson<gary.richard...@gmail.com> wrote:
> Hmm. That's odd..$CAPISTRANO:HOST$ wasn't working for me on Friday. Must be
> them gremlins.
> Is there another variable I can use to get the current host in the ruby
> code? This is what I'm trying to do:
Short answer: no.
Longer answer: yes, kind of.
Keep in mind one key concept: capistrano does not run a command on
each server sequentially; it runs the commands on all servers in
parallel. Thus, within a task, there is no such thing as a "current
host". What you have is a set of servers that match the current task,
and all commands invoked within that task will run in parallel on that
set of servers.
So, what you can do is get the list of matching servers:
task :bootstrap, :roles => :master do
servers = find_servers_for_task(current_task)
servers.each do |server|
puts "host: #{server.host}"
end
end
> task :bootstrap, :roles => [:master] do
> # instanceids is an array containing hostname => instanceid
> id = instanceids["$CAPISTRANO:HOST$"]
> run "register_host -H $CAPISTRANO:HOST$ -s #{id}"
> end
> Obviously, $CAPISTRANO:HOST$ doesn't interpolate on the id = instanceids[]
> line.
> Thanks!
> On Mon, Jul 6, 2009 at 3:31 AM, Rafael G. <r...@aspgems.com> wrote:
>> Gary Richardson wrote:
>> > Hey,
>> > Two part question that I haven't been able to answer:
>> > 1) can I get the current host a task is executing on? I've read some
>> > stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me
>> I tested this task and works for me:
>> task :host_name do
>> run "host $CAPISTRANO:HOST$"
>> end
>> What OS are you using? Could you paste your deploy.rb in
>> someplace(gist.github, pastie,...)?
>> > 2) if I have an array of values (let's say an array that maps ec2 host
>> > names to ec2 instance id's), can I use this same method to look up
>> > something from that array?
>> Capistrano uses ruby If you can do it with ruby you can do the same in a
>> capistrano task.
Gary Richardson wrote:
> Hmm. That's odd..$CAPISTRANO:HOST$ wasn't working for me on Friday. > Must be them gremlins.
> Is there another variable I can use to get the current host in the > ruby code? This is what I'm trying to do:
> task :bootstrap, :roles => [:master] do
> # instanceids is an array containing hostname => instanceid
> id = instanceids["$CAPISTRANO:HOST$"]
> run "register_host -H $CAPISTRANO:HOST$ -s #{id}"
> end
> Obviously, $CAPISTRANO:HOST$ doesn't interpolate on the id = > instanceids[] line.
> Thanks!
> On Mon, Jul 6, 2009 at 3:31 AM, Rafael G. <r...@aspgems.com > <mailto:r...@aspgems.com>> wrote:
> Gary Richardson wrote:
> > Hey,
> > Two part question that I haven't been able to answer:
> > 1) can I get the current host a task is executing on? I've read some
> > stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me
> I tested this task and works for me:
> task :host_name do
> run "host $CAPISTRANO:HOST$"
> end
> What OS are you using? Could you paste your deploy.rb in
> someplace(gist.github, pastie,...)?
> > 2) if I have an array of values (let's say an array that maps
> ec2 host
> > names to ec2 instance id's), can I use this same method to look up
> > something from that array?
> Capistrano uses ruby If you can do it with ruby you can do the
> same in a
> capistrano task.
Jamis Buck wrote:
> On Mon, Jul 6, 2009 at 9:06 AM, Gary
> Richardson<gary.richard...@gmail.com> wrote:
>> Hmm. That's odd..$CAPISTRANO:HOST$ wasn't working for me on Friday. Must be
>> them gremlins.
>> Is there another variable I can use to get the current host in the ruby
>> code? This is what I'm trying to do:
> Short answer: no.
> Longer answer: yes, kind of.
> Keep in mind one key concept: capistrano does not run a command on
> each server sequentially; it runs the commands on all servers in
> parallel. Thus, within a task, there is no such thing as a "current
> host". What you have is a set of servers that match the current task,
> and all commands invoked within that task will run in parallel on that
> set of servers.
> So, what you can do is get the list of matching servers:
> task :bootstrap, :roles => :master do
> servers = find_servers_for_task(current_task)
> servers.each do |server|
> puts "host: #{server.host}"
> end
> end
> - Jamis
>> task :bootstrap, :roles => [:master] do
>> # instanceids is an array containing hostname => instanceid
>> id = instanceids["$CAPISTRANO:HOST$"]
>> run "register_host -H $CAPISTRANO:HOST$ -s #{id}"
>> end
>> Obviously, $CAPISTRANO:HOST$ doesn't interpolate on the id = instanceids[]
>> line.
>> Thanks!
>> On Mon, Jul 6, 2009 at 3:31 AM, Rafael G. <r...@aspgems.com> wrote:
>>> Gary Richardson wrote:
>>>> Hey,
>>>> Two part question that I haven't been able to answer:
>>>> 1) can I get the current host a task is executing on? I've read some
>>>> stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me
>>> I tested this task and works for me:
>>> task :host_name do
>>> run "host $CAPISTRANO:HOST$"
>>> end
>>> What OS are you using? Could you paste your deploy.rb in
>>> someplace(gist.github, pastie,...)?
>>>> 2) if I have an array of values (let's say an array that maps ec2 host
>>>> names to ec2 instance id's), can I use this same method to look up
>>>> something from that array?
>>> Capistrano uses ruby If you can do it with ruby you can do the same in a
>>> capistrano task.
Ok, I'm moving along here. This is what I've come up with:
task :host_name do
servers = find_servers_for_task(current_task)
servers.each do |server|
set :myServer, server.host
set :myId, instanceids[myServer]
real_host_name(:hosts => [myServer])
end
end
task :real_host_name do
run "echo #{myServer} - #{myId}"
end
The problem is that "real_host_name(:hosts => [myServer])" doesn't do what I
expect it to :( -- real_host_name ends up getting called for all hosts in
the current role.
Is there a way to change :hosts/:roles for a sub-task? Or possible call run
with a limited subset of hosts?
On Mon, Jul 6, 2009 at 8:35 AM, Jamis Buck <ja...@37signals.com> wrote:
> On Mon, Jul 6, 2009 at 9:06 AM, Gary
> Richardson<gary.richard...@gmail.com> wrote:
> > Hmm. That's odd..$CAPISTRANO:HOST$ wasn't working for me on Friday. Must
> be
> > them gremlins.
> > Is there another variable I can use to get the current host in the ruby
> > code? This is what I'm trying to do:
> Short answer: no.
> Longer answer: yes, kind of.
> Keep in mind one key concept: capistrano does not run a command on
> each server sequentially; it runs the commands on all servers in
> parallel. Thus, within a task, there is no such thing as a "current
> host". What you have is a set of servers that match the current task,
> and all commands invoked within that task will run in parallel on that
> set of servers.
> So, what you can do is get the list of matching servers:
> task :bootstrap, :roles => :master do
> servers = find_servers_for_task(current_task)
> servers.each do |server|
> puts "host: #{server.host}"
> end
> end
> - Jamis
> > task :bootstrap, :roles => [:master] do
> > # instanceids is an array containing hostname => instanceid
> > id = instanceids["$CAPISTRANO:HOST$"]
> > run "register_host -H $CAPISTRANO:HOST$ -s #{id}"
> > end
> > Obviously, $CAPISTRANO:HOST$ doesn't interpolate on the id =
> instanceids[]
> > line.
> > Thanks!
> > On Mon, Jul 6, 2009 at 3:31 AM, Rafael G. <r...@aspgems.com> wrote:
> >> Gary Richardson wrote:
> >> > Hey,
> >> > Two part question that I haven't been able to answer:
> >> > 1) can I get the current host a task is executing on? I've read some
> >> > stuff about $CAPISTRANO:HOST$, but it doesn't seem to work for me
> >> I tested this task and works for me:
> >> task :host_name do
> >> run "host $CAPISTRANO:HOST$"
> >> end
> >> What OS are you using? Could you paste your deploy.rb in
> >> someplace(gist.github, pastie,...)?
> >> > 2) if I have an array of values (let's say an array that maps ec2 host
> >> > names to ec2 instance id's), can I use this same method to look up
> >> > something from that array?
> >> Capistrano uses ruby If you can do it with ruby you can do the same in a
> >> capistrano task.
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