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Downgrade from Kamal 2 to 1.9

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Add a downgrade command, so you can reverse the upgrade process and go
back to Kamal 1.9. This replaces kamal-proxy and reboots all the
accessories.

This gives an upgrade and downgrade path:

Upgrade:
1. Upgrade config to be Kamal 2 compatible + use kamal 2.0
2. Run `kamal upgrade`

Downgrade:
1. Switch back to previous config + use kamal 1.9
2. Run `kamal downgrade`

You can set `--rolling` to downgrade one host at a time.
This commit is contained in:
Donal McBreen
2024-09-17 18:55:52 +01:00
parent 80bd46cde3
commit 7c7785c1eb
10 changed files with 241 additions and 1 deletions
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84
test/cli/traefik_test.rb
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@@ -103,6 +103,90 @@ class CliTraefikTest < CliTestCase
end
end
test "downgrade" do
Object.any_instance.stubs(:sleep)
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-web-latest$", "--quiet", raise_on_non_zero_exit: false)
.returns("12345678")
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-workers-latest$", "--quiet", raise_on_non_zero_exit: false)
.returns("12345678")
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with { |*args| args[0..1] == [ :sh, "-c" ] }
.returns("123") # old version
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-web-latest$", "--quiet", "|", :xargs, :docker, :inspect, "--format", "'{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}'")
.returns("running") # health check
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-workers-latest$", "--quiet", "|", :xargs, :docker, :inspect, "--format", "'{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}'")
.returns("running").at_least_once # workers health check
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :inspect, "-f '{{ range .Mounts }}{{printf \"%s %s\\n\" .Source .Destination}}{{ end }}'", "app-web-123", "|", :awk, "'$2 == \"/tmp/kamal-cord\" {print $1}'", raise_on_non_zero_exit: false)
.returns("") # old version
run_command("downgrade", "-y").tap do |output|
assert_match "Downgrading to Traefik on 1.1.1.1,1.1.1.2,1.1.1.3,1.1.1.4...", output
assert_match "docker login -u [REDACTED] -p [REDACTED]", output
assert_match "docker container stop kamal-proxy ; docker container prune --force --filter label=org.opencontainers.image.title=kamal-proxy && docker image prune --all --force --filter label=org.opencontainers.image.title=kamal-proxy", output
assert_match "docker container stop traefik", output
assert_match "docker container prune --force --filter label=org.opencontainers.image.title=Traefik", output
assert_match "docker image prune --all --force --filter label=org.opencontainers.image.title=Traefik", output
assert_match "/usr/bin/env mkdir -p .kamal", output
assert_match "docker login -u [REDACTED] -p [REDACTED]", output
assert_match "docker container start traefik || docker run --name traefik --detach --restart unless-stopped --publish 80:80 --volume /var/run/docker.sock:/var/run/docker.sock --env-file .kamal/env/traefik/traefik.env --log-opt max-size=\"10m\" --label traefik.http.routers.catchall.entryPoints=\"http\" --label traefik.http.routers.catchall.rule=\"PathPrefix(\\`/\\`)\" --label traefik.http.routers.catchall.service=\"unavailable\" --label traefik.http.routers.catchall.priority=\"1\" --label traefik.http.services.unavailable.loadbalancer.server.port=\"0\" traefik:v2.10 --providers.docker --log.level=\"DEBUG\"", output
assert_match "/usr/bin/env mkdir -p .kamal", output
assert_match %r{docker rename app-web-latest app-web-latest_replaced_.*}, output
assert_match %r{docker run --detach --restart unless-stopped --name app-web-latest --hostname 1.1.1.1-.* -e KAMAL_CONTAINER_NAME="app-web-latest" -e KAMAL_VERSION="latest" --env-file .kamal/env/roles/app-web.env --health-cmd}, output
assert_match "docker tag dhh/app:latest dhh/app:latest", output
assert_match "/usr/bin/env mkdir -p .kamal", output
assert_match "docker ps -q -a --filter label=service=app --filter status=created --filter status=exited --filter status=dead | tail -n +6 | while read container_id; do docker rm $container_id; done", output
assert_match "docker image prune --force --filter label=service=app", output
assert_match "Downgraded to Traefik on 1.1.1.1,1.1.1.2,1.1.1.3,1.1.1.4", output
end
end
test "downgrade rolling" do
Object.any_instance.stubs(:sleep)
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-web-latest$", "--quiet", raise_on_non_zero_exit: false)
.returns("12345678")
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-workers-latest$", "--quiet", raise_on_non_zero_exit: false)
.returns("12345678")
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with { |*args| args[0..1] == [ :sh, "-c" ] }
.returns("123") # old version
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-web-latest$", "--quiet", "|", :xargs, :docker, :inspect, "--format", "'{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}'")
.returns("running") # health check
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :container, :ls, "--all", "--filter", "name=^app-workers-latest$", "--quiet", "|", :xargs, :docker, :inspect, "--format", "'{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}'")
.returns("running").at_least_once # workers health check
SSHKit::Backend::Abstract.any_instance.stubs(:capture_with_info)
.with(:docker, :inspect, "-f '{{ range .Mounts }}{{printf \"%s %s\\n\" .Source .Destination}}{{ end }}'", "app-web-123", "|", :awk, "'$2 == \"/tmp/kamal-cord\" {print $1}'", raise_on_non_zero_exit: false)
.returns("") # old version
run_command("downgrade", "--rolling", "-y",).tap do |output|
%w[1.1.1.1 1.1.1.2 1.1.1.3 1.1.1.4].each do |host|
assert_match "Downgrading to Traefik on #{host}...", output
assert_match "docker container stop kamal-proxy ; docker container prune --force --filter label=org.opencontainers.image.title=kamal-proxy && docker image prune --all --force --filter label=org.opencontainers.image.title=kamal-proxy", output
assert_match "Downgraded to Traefik on #{host}", output
end
end
end
private
def run_command(*command)
stdouted { Kamal::Cli::Traefik.start([ *command, "-c", "test/fixtures/deploy_with_accessories.yml" ]) }