Swarm routes traffic only to containers that report healthy status, while Minio in distributed mode needs to talk to other peers before it can respond to healthcheck probe. As the Minio containers are not able to talk to each other, distributed Minio is not getting started on Docker Swarm. With this PR, Minio Healthcheck report healthy status for initial 120s enough for distributed Minio to start. After that normal Healthcheck resumes. Also changed the healthcheck method name in accordance with Google shell styleguide.
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| @@ -19,25 +19,40 @@ _init () { · 18 unmodified lines | |||
| 19 | scheme="http://" | 19 | scheme="http://" |
| 20 | address="127.0.0.1:9000" | 20 | address="127.0.0.1:9000" |
| 21 | resource="/minio/index.html" | 21 | resource="/minio/index.html" |
| 22 | start=$(stat -c "%Y" /proc/1) | ||
| 22 | } | 23 | } |
| 23 | 24 | ||
| 24 | HealthCheckMain () { | 25 | healthcheck_main () { |
| 25 | # Get the http response code | 26 | # In distributed environment like Swarm, traffic is routed |
| 26 | http_response=$(curl -s -k -o /dev/null -I -w "%{http_code}" ${scheme}${address}${resource}) | 27 | # to a container only when it reports a `healthy` status. So, we exit |
| 28 | # with 0 to ensure healthy status till distributed Minio starts (120s). | ||
| 29 | # | ||
| 30 | # Refer: https://github.com/moby/moby/pull/28938#issuecomment-301753272 | ||
| 31 | if [ $(( $(date +%s) - start )) -lt 120 ]; then | ||
| 32 | exit 0 | ||
| 33 | else | ||
| 34 | # Get the http response code | ||
| 35 | http_response=$(curl -s -k -o /dev/null -I -w "%{http_code}" \ | ||
| 36 | ${scheme}${address}${resource}) | ||
| 27 | 37 | ||
| 28 | # Get the http response body | 38 | # Get the http response body |
| 29 | http_response_body=$(curl -k -s ${scheme}${address}${resource}) | 39 | http_response_body=$(curl -k -s ${scheme}${address}${resource}) |
| 30 | 40 | ||
| 31 | # server returns response 403 and body "SSL required" if non-TLS connection is attempted on a TLS-configured server. | 41 | # server returns response 403 and body "SSL required" if non-TLS |
| 32 | # change the scheme and try again | 42 | # connection is attempted on a TLS-configured server. Change |
| 33 | if [ "$http_response" = "403" ] && [ "$http_response_body" = "SSL required" ]; then | 43 | # the scheme and try again |
| 34 | scheme="https://" | 44 | if [ "$http_response" = "403" ] && \ |
| 35 | http_response=$(curl -s -k -o /dev/null -I -w "%{http_code}" ${scheme}${address}${resource}) | 45 | [ "$http_response_body" = "SSL required" ]; then |
| 36 | fi | 46 | scheme="https://" |
| 47 | http_response=$(curl -s -k -o /dev/null -I -w "%{http_code}" \ | ||
| 48 | ${scheme}${address}${resource}) | ||
| 49 | fi | ||
| 37 | 50 | ||
| 38 | # If http_repsonse is 200 - server is up. | 51 | # If http_repsonse is 200 - server is up. When MINIO_BROWSER is |
| 39 | # When MINIO_BROWSER is set to off, curl responds with 404. We assume that the the server is up | 52 | # set to off, curl responds with 404. We assume that the server |
| 40 | [ "$http_response" = "200" ] || [ "$http_response" = "404" ] | 53 | # is up |
| 54 | [ "$http_response" = "200" ] || [ "$http_response" = "404" ] | ||
| 55 | fi | ||
| 41 | } | 56 | } |
| 42 | 57 | ||
| 43 | _init && HealthCheckMain | 58 | _init && healthcheck_main |