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Replace Traefik with parachute

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[mproxy](https://github.com/basecamp/parachute) is a custom minimal
proxy designed specifically for Kamal.

It has two big advantages over Traefik:
1. Imperative deployments - we tell it to switch from container A to
   container B, and it waits for container B to start then switches. No
   need to poll for health checks ourselves or mess around with forcing
   health checks to fail.
2. Support for multiple apps - as much as possible, configuration is
   supplied at runtime by the deploy command, allowing us to have
   multiple apps share an instance of mproxy without conflicting config.
This commit is contained in:
Donal McBreen
2024-03-08 08:19:48 +00:00
parent 10b8c826d8
commit 822590dcf6
66 changed files with 754 additions and 1161 deletions
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35
test/configuration/role_test.rb
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@@ -42,7 +42,7 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
end
test "special label args for web" do
assert_equal [ "--label", "service=\"app\"", "--label", "role=\"web\"", "--label", "destination", "--label", "traefik.http.services.app-web.loadbalancer.server.scheme=\"http\"", "--label", "traefik.http.routers.app-web.rule=\"PathPrefix(\\`/\\`)\"", "--label", "traefik.http.routers.app-web.priority=\"2\"", "--label", "traefik.http.middlewares.app-web-retry.retry.attempts=\"5\"", "--label", "traefik.http.middlewares.app-web-retry.retry.initialinterval=\"500ms\"", "--label", "traefik.http.routers.app-web.middlewares=\"app-web-retry@docker\"" ], @config.role(:web).label_args
assert_equal [ "--label", "service=\"app\"", "--label", "role=\"web\"", "--label", "destination" ], @config.role(:web).label_args
end
test "custom labels" do
@@ -56,19 +56,6 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
assert_equal "70", @config_with_roles.role(:workers).labels["my.custom.label"]
end
test "overwriting default traefik label" do
@deploy[:labels] = { "traefik.http.routers.app-web.rule" => "\"Host(\\`example.com\\`) || (Host(\\`example.org\\`) && Path(\\`/traefik\\`))\"" }
assert_equal "\"Host(\\`example.com\\`) || (Host(\\`example.org\\`) && Path(\\`/traefik\\`))\"", @config.role(:web).labels["traefik.http.routers.app-web.rule"]
end
test "default traefik label on non-web role" do
config = Kamal::Configuration.new(@deploy_with_roles.tap { |c|
c[:servers]["beta"] = { "traefik" => "true", "hosts" => [ "1.1.1.5" ] }
})
assert_equal [ "--label", "service=\"app\"", "--label", "role=\"beta\"", "--label", "destination", "--label", "traefik.http.services.app-beta.loadbalancer.server.scheme=\"http\"", "--label", "traefik.http.routers.app-beta.rule=\"PathPrefix(\\`/\\`)\"", "--label", "traefik.http.routers.app-beta.priority=\"2\"", "--label", "traefik.http.middlewares.app-beta-retry.retry.attempts=\"5\"", "--label", "traefik.http.middlewares.app-beta-retry.retry.initialinterval=\"500ms\"", "--label", "traefik.http.routers.app-beta.middlewares=\"app-beta-retry@docker\"" ], config.role(:beta).label_args
end
test "env overwritten by role" do
assert_equal "redis://a/b", @config_with_roles.role(:workers).env("1.1.1.3").clear["REDIS_URL"]
@@ -201,26 +188,6 @@ class ConfigurationRoleTest < ActiveSupport::TestCase
assert_equal ".kamal/env/roles/app-workers.env", @config_with_roles.role(:workers).env("1.1.1.3").secrets_file
end
test "uses cord" do
assert @config_with_roles.role(:web).uses_cord?
assert_not @config_with_roles.role(:workers).uses_cord?
end
test "cord host file" do
assert_match %r{.kamal/cords/app-web-[0-9a-f]{32}/cord}, @config_with_roles.role(:web).cord_host_file
end
test "cord volume" do
assert_equal "/tmp/kamal-cord", @config_with_roles.role(:web).cord_volume.container_path
assert_match %r{.kamal/cords/app-web-[0-9a-f]{32}}, @config_with_roles.role(:web).cord_volume.host_path
assert_equal "--volume", @config_with_roles.role(:web).cord_volume.docker_args[0]
assert_match %r{\$\(pwd\)/.kamal/cords/app-web-[0-9a-f]{32}:/tmp/kamal-cord}, @config_with_roles.role(:web).cord_volume.docker_args[1]
end
test "cord container file" do
assert_equal "/tmp/kamal-cord/cord", @config_with_roles.role(:web).cord_container_file
end
test "asset path and volume args" do
ENV["VERSION"] = "12345"
assert_nil @config_with_roles.role(:web).asset_volume_args