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To further support OTP releases I have added support for generating application appup files. These include instructions that systools uses to generate a relup file which contains the low level instructions needed to perform a hot code upgrade. My goal with this module is to produce "good enough" appup files or at least a skeleton to help one get started with something more complex. If an appup file already exists for an application this command will not attempt to create a new one. Usage: $ rebar generate-appups previous_release=/path/to/old/version Generally this command will be run just before 'generate-upgrade'.
39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
#### Building version 0.1
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rebar compile
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rebar generate
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mv rel/dummy rel/dummy_0.1
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rebar clean
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# start the release:
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cd rel/dummy_0.1
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bin/dummy console
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erl> dummy_server:get_state().
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erl> dummy_server:set_state(123).
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erl> dummy_server:get_state().
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#### Building version 0.2
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# Now, in another terminal we prepare an upgrade..
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# change release version numbers from 0.1 to 0.2 in
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$EDITOR apps/dummy/src/dummy.app.src
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$EDITOR rel/reltool.config
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rebar compile
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rebar generate
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rebar generate-appups previous_release=dummy_0.1
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rebar generate-upgrade previous_release=dummy_0.1
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tar -zvtf rel/dummy_0.2.tar.gz
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#### Deploying with release_handler
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mv rel/dummy_0.2.tar.gz rel/dummy_0.1/releases/
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# Now use release_handler in the running erlang console for the deploy:
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erl> release_handler:unpack_release("dummy_0.2").
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erl> release_handler:install_release("0.2").
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erl> release_handler:make_permanent("0.2").
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erl> release_handler:which_releases().
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erl> dummy_server:get_state().
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