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Add kamal proxy update

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For easy updates from Traefik to kamal-proxy, add `kamal proxy update`.

This stops and removes Traefik and kamal-proxy containers (just in case
it is run after an update). Then it starts kamal-proxy and calls
`kamal-proxy deploy` to route to any app containers that are already
running.

It can be run with a rolling option and calls the `pre-proxy-reboot` and
`post-proxy-reboot` hooks for each host.
This commit is contained in:
Donal McBreen
2024-05-28 15:19:27 +01:00
parent 6568cef868
commit 015c5a6f90
3 changed files with 72 additions and 6 deletions
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44
lib/kamal/cli/proxy.rb
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@@ -60,6 +60,50 @@ class Kamal::Cli::Proxy < Kamal::Cli::Base
end
end
desc "update", "Update from Traefik to kamal-proxy, for when moving from Kamal v1 to Kamal v2"
option :rolling, type: :boolean, default: false, desc: "Reboot proxy on hosts in sequence, rather than in parallel"
option :confirmed, aliases: "-y", type: :boolean, default: false, desc: "Proceed without confirmation question"
def update
confirming "This will cause a brief outage on each host. Are you sure?" do
with_lock do
host_groups = options[:rolling] ? KAMAL.proxy_hosts : [ KAMAL.proxy_hosts ]
host_groups.each do |hosts|
host_list = Array(hosts).join(",")
run_hook "pre-proxy-reboot", hosts: host_list
on(hosts) do
info "Updating proxy from Traefik to kamal-proxy on #{host}..."
execute *KAMAL.auditor.record("Updated proxy from Traefik to kamal-proxy"), verbosity: :debug
execute *KAMAL.registry.login
info "Stopping and removing Traefik on #{host}..."
execute *KAMAL.proxy.stop(name: "traefik"), raise_on_non_zero_exit: false
execute *KAMAL.proxy.remove_container(filter: "label=org.opencontainers.image.title=traefik")
execute *KAMAL.proxy.remove_image(filter: "label=org.opencontainers.image.title=traefik")
info "Stopping and removing kamal-proxy on #{host}, if running..."
execute *KAMAL.proxy.stop, raise_on_non_zero_exit: false
execute *KAMAL.proxy.remove_container
info "Starting kamal-proxy on #{host}..."
execute *KAMAL.proxy.run
KAMAL.roles_on(host).select(&:running_proxy?).each do |role|
app = KAMAL.app(role: role, host: host)
version = capture_with_info(*app.current_running_version, raise_on_non_zero_exit: false).strip
endpoint = capture_with_info(*app.container_endpoint(version: version)).strip
raise Kamal::Cli::BootError, "Failed to get endpoint for #{role} on #{host}, is the app container running?" if endpoint.empty?
info "Deploying #{endpoint} for role `#{role}` on #{host}..."
execute *KAMAL.proxy.deploy(role.container_prefix, target: endpoint)
end
end
run_hook "post-proxy-reboot", hosts: host_list
end
end
end
end
desc "details", "Show details about proxy container from servers"
def details
on(KAMAL.proxy_hosts) { |host| puts_by_host host, capture_with_info(*KAMAL.proxy.info), type: "Proxy" }