emqx4.3/deploy/docker/docker-entrypoint.sh

#!/bin/bash
## EMQ docker image start script
# Huang Rui <vowstar@gmail.com>
# EMQ X Team <support@emqx.io>

## Shell setting
if [[ -n "$DEBUG" ]]; then
    set -ex
else
    set -e
fi

shopt -s nullglob

## Local IP address setting

LOCAL_IP=$(hostname -i | grep -oE '((25[0-5]|(2[0-4]|1[0-9]|[1-9]|)[0-9])\.){3}(25[0-5]|(2[0-4]|1[0-9]|[1-9]|)[0-9])' | head -n 1)

## EMQ Base settings and plugins setting
# Base settings in /opt/emqx/etc/emqx.conf
# Plugin settings in /opt/emqx/etc/plugins

if [[ -z "$EMQX_NAME" ]]; then
    EMQX_NAME="$(hostname)"
    export EMQX_NAME
fi

if [[ -z "$EMQX_HOST" ]]; then
    if [[ "$EMQX_CLUSTER__K8S__ADDRESS_TYPE" == "dns" ]] && [[ -n "$EMQX_CLUSTER__K8S__NAMESPACE" ]]; then
        EMQX_CLUSTER__K8S__SUFFIX=${EMQX_CLUSTER__K8S__SUFFIX:-"pod.cluster.local"}
        EMQX_HOST="${LOCAL_IP//./-}.$EMQX_CLUSTER__K8S__NAMESPACE.$EMQX_CLUSTER__K8S__SUFFIX"
    elif [[ "$EMQX_CLUSTER__K8S__ADDRESS_TYPE" == 'hostname' ]] && [[ -n "$EMQX_CLUSTER__K8S__NAMESPACE" ]]; then
        EMQX_CLUSTER__K8S__SUFFIX=${EMQX_CLUSTER__K8S__SUFFIX:-'svc.cluster.local'}
        EMQX_HOST=$(grep -h "^$LOCAL_IP" /etc/hosts | grep -o "$(hostname).*.$EMQX_CLUSTER__K8S__NAMESPACE.$EMQX_CLUSTER__K8S__SUFFIX")
    else
        EMQX_HOST="$LOCAL_IP"
    fi
    export EMQX_HOST
fi

if [[ -z "$EMQX_NODE_NAME" ]]; then
    export EMQX_NODE_NAME="$EMQX_NAME@$EMQX_HOST"
fi

# fill tuples on specific file
# SYNOPSIS
#     fill_tuples FILE [ELEMENTS ...]
fill_tuples() {
    local file=$1
    local elements=${*:2}
    for var in $elements; do
        if grep -qE "\{\s*$var\s*,\s*(true|false)\s*\}\s*\." "$file"; then
            sed -r "s/\{\s*($var)\s*,\s*(true|false)\s*\}\s*\./{\1, true}./1" "$file" > tmpfile && cat tmpfile > "$file" 
        elif grep -q "$var\s*\." "$file"; then
            # backward compatible.
            sed -r "s/($var)\s*\./{\1, true}./1" "$file" > tmpfile && cat tmpfile > "$file"
        else
            sed '$a'\\ "$file" > tmpfile && cat tmpfile > "$file"
            echo "{$var, true}." >> "$file"
        fi
    done
}

# The default rpc port discovery 'stateless' is mostly for clusters
# having static node names. So it's troulbe-free for multiple emqx nodes
# running on the same host.
# When start emqx in docker, it's mostly one emqx node in one container
export EMQX_RPC__PORT_DISCOVERY="${EMQX_RPC__PORT_DISCOVERY:-manual}"

exec "$@"