A simple shell to run ElasticSearch and Kibana docker images

docker_elastickibanastack.sh

#!/bin/bash

#Some variables
ELASTICSEARCH_VERSION="6.5.3"
KIBANA_VERSION="6.5.3"
ELASTICSEARCH_PWD="secret"

#Define a "wait for service" function
WaitForService () {
    while (true);
    do
        if curl -s --head $1 | head -n 1 | grep "HTTP/1.[01] [23].." > /dev/null;
        then 
            printf "$3\n"
            break
        else
            printf "$2\n"
            sleep 2s
        fi
    done
}

#Create a common network, to let the 2 containers communicate
docker network create elastic_network --driver=bridge

#Create ElasticSearch
docker run \
    -d \
    --restart always \
    -p 9200:9200 \
    -p 9300:9300 \
    --network elastic_network \
    -e "discovery.type=single-node" \
    -e "transport.host=0.0.0.0" \
    -e ELASTIC_PASSWORD=$ELASTICSEARCH_PWD \
    -e "bootstrap.memory_lock=true" \
    --ulimit memlock=-1:-1 \
    --name elastic \
    docker.elastic.co/elasticsearch/elasticsearch:$ELASTICSEARCH_VERSION

#Wait for ElasticSearch to be started
WaitForService 'http://localhost:9200' 'Waiting for ElasticSearch to be started...' 'ElasticSearch started!'

#Change allocated memory
sudo docker exec -it elastic sh -c "sed -i 's/-Xms1g/-Xms8g/g' /usr/share/elasticsearch/config/jvm.options"
sudo docker exec -it elastic sh -c "sed -i 's/-Xmx1g/-Xmx24g/g' /usr/share/elasticsearch/config/jvm.options"

#Restart ElasticSearch to make change available
docker restart elastic

#Wait for ElasticSearch to be started
WaitForService 'http://localhost:9200' 'Waiting for ElasticSearch to be started...' 'ElasticSearch started!'

#Start Kibana
docker run \
    -d \
    --restart always \
    --network elastic_network \
    -e "ELASTICSEARCH_URL=http://elastic:9200" \
    -e ELASTICSEARCH_PASSWORD="$ELASTICSEARCH_PWD"  \
    -p 5601:5601 \
    --name kibana \
    docker.elastic.co/kibana/kibana:$KIBANA_VERSION

#Wait for Kibana to be started
WaitForService 'http://localhost:5601' 'Waiting for Kibana to be started...' 'Kibana started!'

#Bye bye
printf "All services are up. Have fun!\n"