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Limit rolling deployment to boot operation

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This commit is contained in:
Kevin McConnell
2023-04-14 10:41:07 +01:00
parent f530009a6e
commit 100b72e4b4
2 changed files with 5 additions and 5 deletions
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8
README.md
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@@ -831,11 +831,11 @@ mrsk lock acquire -m "Doing maintanence"
mrsk lock release mrsk lock release
``` ```
## Gradual restarts ## Rolling deployments
When deploying to large numbers of hosts, you might prefer not to restart your services on every host at the same time. When deploying to large numbers of hosts, you might prefer not to restart your services on every host at the same time.
MRSK's default is to start new containers on all hosts in parallel. But you can control this by configuring `group_limit` and `group_wait`. MRSK's default is to boot new containers on all hosts in parallel. But you can control this by configuring `group_limit` and `group_wait`.
```yaml ```yaml
service: myservice service: myservice
@@ -844,9 +844,9 @@ group_limit: 10
group_wait: 30 group_wait: 30
``` ```
When `group_limit` is specified, containers will be started on, at most, `group_limit` hosts at once. MRSK will pause for `group_wait` seconds between batches. When `group_limit` is specified, containers will be booted on, at most, `group_limit` hosts at once. MRSK will pause for `group_wait` seconds between batches.
These settings only apply when starting containers (using `mrsk deploy`, `mrsk app boot` or `mrsk app start`). For other commands, MRSK continues to run commands in parallel across all hosts. These settings only apply when booting containers (using `mrsk deploy`, or `mrsk app boot`). For other commands, MRSK continues to run commands in parallel across all hosts.
## Stage of development ## Stage of development

2
lib/mrsk/cli/app.rb
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@@ -39,7 +39,7 @@ class Mrsk::Cli::App < Mrsk::Cli::Base
desc "start", "Start existing app container on servers" desc "start", "Start existing app container on servers"
def start def start
with_lock do with_lock do
on(MRSK.hosts, **MRSK.config.group_strategy) do |host| on(MRSK.hosts) do |host|
roles = MRSK.roles_on(host) roles = MRSK.roles_on(host)
roles.each do |role| roles.each do |role|