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✨(apps) add elasticsearch application
Add an independant elasticsearch app with a configurable high availability cluster. It is designed to run without persistent volume and it supports rolling updates without any data loss. On the other hand, a full restart of the ES cluster (without rolling update) results in data loss and requires to recreate indexes.
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7 changes: 7 additions & 0 deletions
7
apps/elasticsearch/templates/services/app/configs/elasticsearch.yml.j2
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,7 @@ | ||
| cluster.name: {{ elasticsearch_cluster_name }} | ||
| network.host: "0.0.0.0" | ||
| bootstrap.memory_lock: false | ||
| discovery.zen.ping.unicast.hosts: elasticsearch-discovery.{{ project_name }}.svc | ||
| discovery.zen.minimum_master_nodes: 2 | ||
| xpack.security.enabled: false | ||
| xpack.monitoring.enabled: false |
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apps/elasticsearch/templates/services/app/configs/readiness-probe.sh.j2
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,52 @@ | ||
| #!/usr/bin/env bash | ||
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| set -eo pipefail | ||
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| ES_HOST="127.0.0.1" | ||
| ES_PORT="{{ elasticsearch_api_port }}" | ||
| ES_STARTED="/tmp/es_started" | ||
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| testStatus() { | ||
| status_to_test="${1}" | ||
| expected_status="${2}" | ||
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| declare -A statuses=( ["red"]=1 ["yellow"]=2 ["green"]=3) | ||
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| if [[ -z "$status_to_test" || -z "${statuses[$status_to_test]}" ]] ; then | ||
| echo "Error : unknown status_to_test [$status_to_test]" 1>&2 | ||
| exit 1 | ||
| fi | ||
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| if [[ -z "$expected_status" || -z "${statuses[$expected_status]}" ]]; then | ||
| echo "Error : unknown expected_status [$expected_status]" 1>&2 | ||
| exit 1 | ||
| fi | ||
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| if [ ${statuses[$status_to_test]} -lt ${statuses[$expected_status]} ]; then | ||
| echo "Assertion failed : $status_to_test < $expected_status" | ||
| exit 1 | ||
| fi | ||
| } | ||
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| if [ -f "$ES_STARTED" ]; then | ||
| echo "Elasticsearch is already running. Checking if API is alive" | ||
| curl -fsSL "http://${ES_HOST}:${ES_PORT}/" > /dev/null | ||
| echo "OK" | ||
| else | ||
| echo "Waiting for elasticsearch cluster to be running and in green state" | ||
| health_status=$(curl -fsSL "http://${ES_HOST}:${ES_PORT}/_cat/health?h=status" | sed -r 's/^[[:space:]]+|[[:space:]]+$//g') | ||
| testStatus "$health_status" "green" | ||
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| echo "Waiting for initializing_shards to be 0" | ||
| init_shards=$(curl -fsSL "http://${ES_HOST}:${ES_PORT}/_cat/health?h=init" | sed -r 's/^[[:space:]]+|[[:space:]]+$//g') | ||
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| if [ "${init_shards}" -gt 0 ]; then | ||
| echo "Synchronization not ready yet, initializing_shards = ${init_shards}" | ||
| exit 1 | ||
| fi | ||
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| touch "$ES_STARTED" | ||
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| echo "Elasticsearch cluster is up (status = ${health_status})" | ||
| fi |
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apps/elasticsearch/templates/services/app/configs/set-index-template.sh.j2
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| #!/usr/bin/env bash | ||
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| MAX_RETRY=20 | ||
| RETRY_DELAY=5 | ||
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| while ! curl --output /dev/null --silent --max-time 1 --connect-timeout 1 --head --fail "http://elasticsearch.{{project_name}}.svc:{{ elasticsearch_api_port }}/" | ||
| do | ||
| echo "Waiting for ES service to be up..." | ||
| ((c++)) && ((c==$MAX_RETRY)) && break | ||
| sleep $RETRY_DELAY | ||
| done | ||
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| set -e | ||
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| curl -fssL -X PUT "http://elasticsearch.{{project_name}}.svc:{{ elasticsearch_api_port }}/_template/default" -H 'Content-Type: application/json' -d' | ||
| { | ||
| {% if elasticsearch_image_tag is version('6.0', '<') %} | ||
| "template" : "*", | ||
| {% else %} | ||
| "index_patterns": ["*"], | ||
| {% endif %} | ||
| "settings" : { | ||
| "number_of_shards": {{ elasticsearch_index_default_shards }}, | ||
| "number_of_replicas": {{ elasticsearch_index_default_replicas }}, | ||
| "index.store.type": "{{elasticsearch_index_store_type}}", | ||
| "index.unassigned.node_left.delayed_timeout": "{{elasticsearch_index_node_left_delayed_timeout}}" | ||
| } | ||
| } | ||
| ' |
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