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a demo for imperfect rolling update #13

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merged 1 commit into from
Sep 22, 2023
Merged

a demo for imperfect rolling update #13

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14 changes: 7 additions & 7 deletions demo/docker-compose.yaml
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Original file line number Diff line number Diff line change
@@ -1,15 +1,15 @@
version: "3"
services:
demo-server-g1: &demo-server
build:
context: ..
dockerfile: demo/Dockerfile
# build:
# context: ..
# dockerfile: demo/Dockerfile
# dockerfile: demo/Dockerfile-alpine
# image: ghcr.io/jokester/publicaddr:pr-1
image: ${SLOT1_IMAGE}
command: npm start
working_dir: /opt/publicaddr/demo
deploy:
replicas: 6
replicas: ${SLOT1_REPLICA:-4}
# NOTE I have no idea how to get default network_mode (requires port mapping) + replica working
# network_mode=host (and perhaps some other) works with SO_REUSEPORT
network_mode: host
Expand All @@ -25,6 +25,6 @@ services:
# 5. docker-compose up -d # user starts to see reply from g2
demo-server-g2:
<<: *demo-server
# image: ghcr.io/jokester/publicaddr:pr-1
image: ${SLOT2_IMAGE}
deploy:
replicas: 0
replicas: ${SLOT2_REPLICA:-0}
35 changes: 35 additions & 0 deletions demo/rolling-update.sh
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Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
#!/usr/bin/env bash

set -ue
cd $(dirname "$0")


OLD_IMAGE=ghcr.io/jokester/publicaddr:sha-2ab74ce
NEW_IMAGE=ghcr.io/jokester/publicaddr:sha-12620a3

# SLOT1_IMAGE=""
# SLOT2_IMAGE=""

# start with old images
#
init () {
docker-compose up -d
}

case "${1:-UNDEF}" in
UNDEF)
cat <<END
USAGE: $0 reset|upgrade
END
;;
reset)
SLOT1_IMAGE=$OLD_IMAGE SLOT2_IMAGE=$OLD_IMAGE docker-compose up -d
;;
upgrade)
SLOT1_IMAGE=$OLD_IMAGE SLOT2_IMAGE=$NEW_IMAGE SLOT1_REPLICA=2 SLOT2_REPLICA=2 docker-compose up -d
SLOT1_IMAGE=$OLD_IMAGE SLOT2_IMAGE=$NEW_IMAGE SLOT1_REPLICA=0 SLOT2_REPLICA=4 docker-compose up -d
SLOT1_IMAGE=$NEW_IMAGE SLOT2_IMAGE=$NEW_IMAGE SLOT1_REPLICA=2 SLOT2_REPLICA=2 docker-compose up -d
SLOT1_IMAGE=$NEW_IMAGE SLOT2_IMAGE=$NEW_IMAGE SLOT1_REPLICA=4 SLOT2_REPLICA=0 docker-compose up -d

esac