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To support OTP release upgrades I have added support for building upgrade packages. Support for this is included in the rebar_upgrade module, specifically generate_upgrade/2. It requires one variable to be set on the command line 'previous_release' which is the absolute path or relative path from 'rel/' to the previous release one is upgrading from. Running an upgrade will create the needed files, including a relup and result in a tarball containing the upgrade being written to 'rel/'. When done it cleans up the temporary files systools created. Usage: $ rebar generate-upgrade previous_release=/path/to/old/version This also includes a dummy application that can be used to test upgrades as well as an example. Special thanks to Daniel Reverri, Jesper Louis Andersen and Richard Jones for comments and patches.
38 lines
1 KiB
Markdown
38 lines
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-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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