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Replace Traefik with kamal-proxy

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

It has some 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 a proxy without conflicting config.
3. First class support for Kamal operations - rather than trying to
   work out how to make Traefik do what we want, we can build features
   directly into the proxy, making configuration simpler and avoiding
   obscure errors
This commit is contained in:
Donal McBreen
2024-03-08 08:19:48 +00:00
parent 90ecb6a12a
commit 6568cef868
66 changed files with 746 additions and 1161 deletions
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25
test/configuration_test.rb
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@@ -74,22 +74,22 @@ class ConfigurationTest < ActiveSupport::TestCase
assert_equal "1.1.1.1", @config_with_roles.primary_host
end
test "traefik hosts" do
assert_equal [ "1.1.1.1", "1.1.1.2" ], @config_with_roles.traefik_hosts
test "proxy hosts" do
assert_equal [ "1.1.1.1", "1.1.1.2" ], @config_with_roles.proxy_hosts
@deploy_with_roles[:servers]["workers"]["traefik"] = true
@deploy_with_roles[:servers]["workers"]["proxy"] = true
config = Kamal::Configuration.new(@deploy_with_roles)
assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3" ], config.traefik_hosts
assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3" ], config.proxy_hosts
end
test "filtered traefik hosts" do
assert_equal [ "1.1.1.1", "1.1.1.2" ], @config_with_roles.traefik_hosts
test "filtered proxy hosts" do
assert_equal [ "1.1.1.1", "1.1.1.2" ], @config_with_roles.proxy_hosts
@deploy_with_roles[:servers]["workers"]["traefik"] = true
@deploy_with_roles[:servers]["workers"]["proxy"] = true
config = Kamal::Configuration.new(@deploy_with_roles)
assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3" ], config.traefik_hosts
assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3" ], config.proxy_hosts
end
test "version no git repo" do
@@ -154,10 +154,6 @@ class ConfigurationTest < ActiveSupport::TestCase
assert_equal "app-missing", @config.service_with_version
end
test "healthcheck service" do
assert_equal "healthcheck-app", @config.healthcheck_service
end
test "valid config" do
assert @config.valid?
assert @config_with_roles.valid?
@@ -271,8 +267,7 @@ class ConfigurationTest < ActiveSupport::TestCase
sshkit: {},
volume_args: [ "--volume", "/local/path:/container/path" ],
builder: {},
logging: [ "--log-opt", "max-size=\"10m\"" ],
healthcheck: { "path"=>"/up", "port"=>3000, "max_attempts" => 7, "cord" => "/tmp/kamal-cord", "log_lines" => 50 } }
logging: [ "--log-opt", "max-size=\"10m\"" ] }
assert_equal expected_config, @config.to_h
end
@@ -330,7 +325,7 @@ class ConfigurationTest < ActiveSupport::TestCase
assert_equal "alternate_web", config.primary_role.name
assert_equal "1.1.1.4", config.primary_host
assert config.role(:alternate_web).primary?
assert config.role(:alternate_web).running_traefik?
assert config.role(:alternate_web).running_proxy?
end
test "primary role missing" do