zabbix-docker/Dockerfiles/agent/alpine/docker-entrypoint.sh
2021-09-15 22:31:18 +02:00

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#!/bin/bash
set -o pipefail
set +e
# Script trace mode
if [ "${DEBUG_MODE,,}" == "true" ]; then
set -o xtrace
fi
# Default Zabbix installation name
# Default Zabbix server host
: ${ZBX_SERVER_HOST:="zabbix-server"}
# Default Zabbix server port number
: ${ZBX_SERVER_PORT:="10051"}
# Default directories
# User 'zabbix' home directory
ZABBIX_USER_HOME_DIR="/var/lib/zabbix"
# Configuration files directory
ZABBIX_ETC_DIR="/etc/zabbix"
escape_spec_char() {
local var_value=$1
var_value="${var_value//\\/\\\\}"
var_value="${var_value//[$'\n']/}"
var_value="${var_value//\//\\/}"
var_value="${var_value//./\\.}"
var_value="${var_value//\*/\\*}"
var_value="${var_value//^/\\^}"
var_value="${var_value//\$/\\\$}"
var_value="${var_value//\&/\\\&}"
var_value="${var_value//\[/\\[}"
var_value="${var_value//\]/\\]}"
echo "$var_value"
}
update_config_var() {
local config_path=$1
local var_name=$2
local var_value=$3
local is_multiple=$4
local masklist=("TLSPSKIdentity")
if [ ! -f "$config_path" ]; then
echo "**** Configuration file '$config_path' does not exist"
return
fi
if [[ " ${masklist[@]} " =~ " $var_name " ]] && [ ! -z "$var_value" ]; then
echo -n "** Updating '$config_path' parameter \"$var_name\": '****'. Enable DEBUG_MODE to view value ..."
else
echo -n "** Updating '$config_path' parameter \"$var_name\": '$var_value'..."
fi
# Remove configuration parameter definition in case of unset parameter value
if [ -z "$var_value" ]; then
sed -i -e "/^$var_name=/d" "$config_path"
echo "removed"
return
fi
# Remove value from configuration parameter in case of double quoted parameter value
if [ "$var_value" == '""' ]; then
sed -i -e "/^$var_name=/s/=.*/=/" "$config_path"
echo "undefined"
return
fi
# Use full path to a file for TLS related configuration parameters
if [[ $var_name =~ ^TLS.*File$ ]]; then
var_value=$ZABBIX_USER_HOME_DIR/enc/$var_value
fi
# Escaping characters in parameter value and name
var_value=$(escape_spec_char "$var_value")
var_name=$(escape_spec_char "$var_name")
if [ "$(grep -E "^$var_name=" $config_path)" ] && [ "$is_multiple" != "true" ]; then
sed -i -e "/^$var_name=/s/=.*/=$var_value/" "$config_path"
echo "updated"
elif [ "$(grep -Ec "^# $var_name=" $config_path)" -gt 1 ]; then
sed -i -e "/^[#;] $var_name=$/i\\$var_name=$var_value" "$config_path"
echo "added first occurrence"
elif [ "$(grep -Ec "^[#;] $var_name=" $config_path)" -gt 0 ]; then
sed -i -e "/^[#;] $var_name=/s/.*/&\n$var_name=$var_value/" "$config_path"
echo "added"
else
sed -i -e '$a\' -e "$var_name=$var_value" "$config_path"
echo "added at the end"
fi
}
update_config_multiple_var() {
local config_path=$1
local var_name=$2
local var_value=$3
var_value="${var_value%\"}"
var_value="${var_value#\"}"
local IFS=,
local OPT_LIST=($var_value)
for value in "${OPT_LIST[@]}"; do
update_config_var $config_path $var_name $value true
done
}
prepare_zbx_agent_config() {
echo "** Preparing Zabbix agent configuration file"
ZBX_AGENT_CONFIG=$ZABBIX_ETC_DIR/zabbix_agentd.conf
: ${ZBX_PASSIVESERVERS:=""}
: ${ZBX_ACTIVESERVERS:=""}
[ -n "$ZBX_PASSIVESERVERS" ] && ZBX_PASSIVESERVERS=","$ZBX_PASSIVESERVERS
ZBX_PASSIVESERVERS=$ZBX_SERVER_HOST$ZBX_PASSIVESERVERS
[ -n "$ZBX_ACTIVESERVERS" ] && ZBX_ACTIVESERVERS=","$ZBX_ACTIVESERVERS
ZBX_ACTIVESERVERS=$ZBX_SERVER_HOST":"$ZBX_SERVER_PORT$ZBX_ACTIVESERVERS
update_config_var $ZBX_AGENT_CONFIG "PidFile"
update_config_var $ZBX_AGENT_CONFIG "LogType" "console"
update_config_var $ZBX_AGENT_CONFIG "LogFile"
update_config_var $ZBX_AGENT_CONFIG "LogFileSize"
update_config_var $ZBX_AGENT_CONFIG "DebugLevel" "${ZBX_DEBUGLEVEL}"
update_config_var $ZBX_AGENT_CONFIG "SourceIP"
update_config_var $ZBX_AGENT_CONFIG "LogRemoteCommands" "${ZBX_LOGREMOTECOMMANDS}"
: ${ZBX_PASSIVE_ALLOW:="true"}
if [ "${ZBX_PASSIVE_ALLOW,,}" == "true" ]; then
echo "** Using '$ZBX_PASSIVESERVERS' servers for passive checks"
update_config_var $ZBX_AGENT_CONFIG "Server" "${ZBX_PASSIVESERVERS}"
else
update_config_var $ZBX_AGENT_CONFIG "Server"
fi
update_config_var $ZBX_AGENT_CONFIG "ListenPort" "${ZBX_LISTENPORT}"
update_config_var $ZBX_AGENT_CONFIG "ListenIP" "${ZBX_LISTENIP}"
update_config_var $ZBX_AGENT_CONFIG "StartAgents" "${ZBX_STARTAGENTS}"
: ${ZBX_ACTIVE_ALLOW:="true"}
if [ "${ZBX_ACTIVE_ALLOW,,}" == "true" ]; then
echo "** Using '$ZBX_ACTIVESERVERS' servers for active checks"
update_config_var $ZBX_AGENT_CONFIG "ServerActive" "${ZBX_ACTIVESERVERS}"
else
update_config_var $ZBX_AGENT_CONFIG "ServerActive"
fi
update_config_var $ZBX_AGENT_CONFIG "HostInterface" "${ZBX_HOSTINTERFACE}"
update_config_var $ZBX_AGENT_CONFIG "HostInterfaceItem" "${ZBX_HOSTINTERFACEITEM}"
update_config_var $ZBX_AGENT_CONFIG "Hostname" "${ZBX_HOSTNAME}"
update_config_var $ZBX_AGENT_CONFIG "HostnameItem" "${ZBX_HOSTNAMEITEM}"
update_config_var $ZBX_AGENT_CONFIG "HostMetadata" "${ZBX_METADATA}"
update_config_var $ZBX_AGENT_CONFIG "HostMetadataItem" "${ZBX_METADATAITEM}"
update_config_var $ZBX_AGENT_CONFIG "RefreshActiveChecks" "${ZBX_REFRESHACTIVECHECKS}"
update_config_var $ZBX_AGENT_CONFIG "BufferSend" "${ZBX_BUFFERSEND}"
update_config_var $ZBX_AGENT_CONFIG "BufferSize" "${ZBX_BUFFERSIZE}"
update_config_var $ZBX_AGENT_CONFIG "MaxLinesPerSecond" "${ZBX_MAXLINESPERSECOND}"
# Please use include to enable Alias feature
# update_config_multiple_var $ZBX_AGENT_CONFIG "Alias" ${ZBX_ALIAS}
update_config_var $ZBX_AGENT_CONFIG "Timeout" "${ZBX_TIMEOUT}"
update_config_var $ZBX_AGENT_CONFIG "Include" "/etc/zabbix/zabbix_agentd.d/"
update_config_var $ZBX_AGENT_CONFIG "UnsafeUserParameters" "${ZBX_UNSAFEUSERPARAMETERS}"
update_config_var $ZBX_AGENT_CONFIG "LoadModulePath" "$ZABBIX_USER_HOME_DIR/modules/"
update_config_multiple_var $ZBX_AGENT_CONFIG "LoadModule" "${ZBX_LOADMODULE}"
update_config_var $ZBX_AGENT_CONFIG "TLSConnect" "${ZBX_TLSCONNECT}"
update_config_var $ZBX_AGENT_CONFIG "TLSAccept" "${ZBX_TLSACCEPT}"
update_config_var $ZBX_AGENT_CONFIG "TLSCAFile" "${ZBX_TLSCAFILE}"
update_config_var $ZBX_AGENT_CONFIG "TLSCRLFile" "${ZBX_TLSCRLFILE}"
update_config_var $ZBX_AGENT_CONFIG "TLSServerCertIssuer" "${ZBX_TLSSERVERCERTISSUER}"
update_config_var $ZBX_AGENT_CONFIG "TLSServerCertSubject" "${ZBX_TLSSERVERCERTSUBJECT}"
update_config_var $ZBX_AGENT_CONFIG "TLSCertFile" "${ZBX_TLSCERTFILE}"
update_config_var $ZBX_AGENT_CONFIG "TLSCipherAll" "${ZBX_TLSCIPHERALL}"
update_config_var $ZBX_AGENT_CONFIG "TLSCipherAll13" "${ZBX_TLSCIPHERALL13}"
update_config_var $ZBX_AGENT_CONFIG "TLSCipherCert" "${ZBX_TLSCIPHERCERT}"
update_config_var $ZBX_AGENT_CONFIG "TLSCipherCert13" "${ZBX_TLSCIPHERCERT13}"
update_config_var $ZBX_AGENT_CONFIG "TLSCipherPSK" "${ZBX_TLSCIPHERPSK}"
update_config_var $ZBX_AGENT_CONFIG "TLSCipherPSK13" "${ZBX_TLSCIPHERPSK13}"
update_config_var $ZBX_AGENT_CONFIG "TLSKeyFile" "${ZBX_TLSKEYFILE}"
update_config_var $ZBX_AGENT_CONFIG "TLSPSKIdentity" "${ZBX_TLSPSKIDENTITY}"
update_config_var $ZBX_AGENT_CONFIG "TLSPSKFile" "${ZBX_TLSPSKFILE}"
update_config_multiple_var $ZBX_AGENT_CONFIG "DenyKey" "${ZBX_DENYKEY}"
update_config_multiple_var $ZBX_AGENT_CONFIG "AllowKey" "${ZBX_ALLOWKEY}"
if [ "$(id -u)" != '0' ]; then
update_config_var $ZBX_AGENT_CONFIG "User" "$(whoami)"
else
update_config_var $ZBX_AGENT_CONFIG "AllowRoot" "1"
fi
}
prepare_agent() {
echo "** Preparing Zabbix agent"
prepare_zbx_agent_config
}
#################################################
if [ "${1#-}" != "$1" ]; then
set -- /usr/sbin/zabbix_agentd "$@"
fi
if [ "$1" == '/usr/sbin/zabbix_agentd' ]; then
prepare_agent
fi
exec "$@"
#################################################