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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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23 changes: 23 additions & 0 deletions
23
apps/elasticsearch/templates/services/app/configs/elasticsearch.yml.j2
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| cluster.name: {{ elasticsearch_cluster_name }} | ||
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| # Bind address (listen to all interfaces) | ||
| network.host: "0.0.0.0" | ||
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| {% if elasticsearch_image_tag is version('6.0', '<') %} | ||
| bootstrap.mlockall: {{elasticsearch_memory_lock}} | ||
| {% else %} | ||
| bootstrap.memory_lock: {{elasticsearch_memory_lock}} | ||
| {% endif %} | ||
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| # Cluster discovery address, to get the peer list. | ||
| # This is a kubernetes service that target every ES running nodes, even if they | ||
| # are not ready yet. | ||
| discovery.zen.ping.unicast.hosts: elasticsearch-discovery.{{ project_name }}.svc | ||
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| discovery.zen.minimum_master_nodes: {{ elasticsearch_minimum_master_nodes }} | ||
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| # Security features are disabled by default on ES basic and trial licenses | ||
| xpack.security.enabled: false | ||
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| # Monitoring is not supported in this arnold application yet | ||
| xpack.monitoring.enabled: false |
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57
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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| #!/usr/bin/env bash | ||
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| set -eo pipefail | ||
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| declare -r ES_HOST="127.0.0.1" | ||
| declare -i ES_PORT={{ elasticsearch_api_port }} | ||
| declare -r ES_STARTED="/tmp/es_started" | ||
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| function 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 2 | ||
| fi | ||
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| if [ "${statuses[$status_to_test]}" -lt "${statuses[${expected_status}]}" ]; then | ||
| echo "Assertion failed: ${status_to_test} < ${expected_status}" | ||
| exit 3 | ||
| fi | ||
| } | ||
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| if [ -f "${ES_STARTED}" ]; then | ||
| echo -n "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 = ${init_shards}" | ||
| exit 4 | ||
| fi | ||
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| touch "${ES_STARTED}" | ||
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| echo "Elasticsearch cluster is up (status = ${health_status})" | ||
| fi |
33 changes: 33 additions & 0 deletions
33
apps/elasticsearch/templates/services/app/configs/set-index-template.sh.j2
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| #!/usr/bin/env bash | ||
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| set -eo pipefail | ||
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| declare -i MAX_RETRY=20 | ||
| declare -i RETRY_DELAY=5 | ||
| declare -i retry=0 | ||
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| echo -n "Waiting for ES service to be up." | ||
| while ! curl --output /dev/null --silent --max-time 1 --connect-timeout 1 --head --fail "http://elasticsearch.{{project_name}}.svc:{{ elasticsearch_api_port }}/" | ||
| do | ||
| echo -n "." | ||
| ((retry++)) && ((retry==MAX_RETRY)) && echo "ERROR: timeout" && exit 62 | ||
| sleep $RETRY_DELAY | ||
| done | ||
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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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