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85 lines
2.1 KiB
Bash
85 lines
2.1 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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if [[ $# -lt 4 ]]; then
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echo "Usage: $0 <stack-name> <service-name> <stack-file> <health-url> [expected-replicas]" >&2
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exit 1
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fi
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STACK_NAME="$1"
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SERVICE_NAME="$2"
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STACK_FILE="$3"
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HEALTH_URL="$4"
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EXPECTED_REPLICAS="${5:-4}"
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SERVICE_FQDN="${STACK_NAME}_${SERVICE_NAME}"
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LOG_PREFIX="[swarm-deploy]"
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log() {
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printf '%s %s %s\n' "$(date --iso-8601=seconds)" "$LOG_PREFIX" "$*"
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}
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retry() {
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local attempts=$1; shift
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local delay=$1; shift
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local n=1
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while true; do
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if "$@"; then
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return 0
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fi
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if (( n == attempts )); then
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return 1
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fi
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((n++))
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sleep "$delay"
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done
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}
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log "Deploying stack '${STACK_NAME}' using ${STACK_FILE}"
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docker stack deploy --compose-file "$STACK_FILE" "$STACK_NAME"
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log "Waiting for service ${SERVICE_FQDN} to reach ${EXPECTED_REPLICAS} replicas"
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retries=24
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while (( retries > 0 )); do
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replicas_raw=$(docker service ls --filter "name=${SERVICE_FQDN}" --format '{{.Replicas}}' || true)
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if [[ -z "$replicas_raw" ]]; then
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log "Service ${SERVICE_FQDN} not found yet; retrying"
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sleep 5
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((retries--))
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continue
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fi
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replicas_clean=${replicas_raw%% (*}
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running=${replicas_clean%%/*}
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desired=${replicas_clean##*/}
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if [[ "$running" == "$desired" && "$running" == "$EXPECTED_REPLICAS" ]]; then
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log "Service reached desired replica count: ${running}/${desired}"
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break
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fi
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log "Current replicas ${running}/${desired}; waiting..."
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sleep 5
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((retries--))
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done
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if (( retries == 0 )); then
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log "Timed out waiting for replicas"
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docker service ps "$SERVICE_FQDN"
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exit 1
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fi
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log "Checking task states"
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if ! docker service ps "$SERVICE_FQDN" --no-trunc --filter 'desired-state=Running' --format '{{.CurrentState}}' | grep -q '^Running '; then
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log "Some tasks are not running"
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docker service ps "$SERVICE_FQDN"
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exit 1
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fi
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log "Running health check against ${HEALTH_URL}"
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if ! retry 3 5 curl -fsS "$HEALTH_URL"; then
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log "Health check failed; rolling back service"
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docker service update --rollback "$SERVICE_FQDN" || true
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exit 1
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fi
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log "Health check succeeded"
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log "Deployment finished successfully"
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