This script checks the configuration syntax of various services on a Linux system. It executes predefined check commands for each service, verifies the output, and reports whether the service configuration is valid or not. The script supports common services like Nginx, Apache, SSH, and others. The script is easily expandable—services can be add…

check_service_syntax.sh

#!/bin/bash

# ===========================
# Service Configuration
# ===========================
# Format: "<Service Name>;<Check Command>;<Expected String>"
SERVICES=(
    "apache;apachectl configtest;Syntax OK"
    #"haproxy;haproxy -c -f /etc/haproxy/haproxy.cfg;Configuration file is valid"
    "nginx;nginx -t;syntax is ok"
    "rspamd;rspamadm configtest;syntax OK"
    "ssh;sshd -t;syntax OK"
    "syslog-ng;syslog-ng -s;Syntax OK"
    "php-fpm;php-fpm -t;test is successful"
)

# ===========================
# Configuration
# ===========================
# Set SHOW_OUTPUT to true to show command outputs under the status line, false to hide them
SHOW_OUTPUT=true

# ===========================
# Color Codes for Output
# ===========================
BOLD="\e[1m"
GREEN="\e[32m"
RED="\e[31m"
RESET="\e[0m"

# ===========================
# Service Check Function
# ===========================
check_service() {
    local service_name="$1"
    local check_command="$2"
    local expected_string="$3"

    # Execute the check command and capture the output
    output=$($check_command 2>&1)

    # If the output is empty, consider the service as valid
    if [[ -z "$output" ]]; then
        echo -e "[${BOLD}${GREEN}Valid${RESET}] ${BOLD}$service_name${RESET}"
        if $SHOW_OUTPUT; then
            echo -e "    (No output)"
        fi
    else
        # Check if expected string is present in the output
        if [[ -n "$expected_string" ]] && echo "$output" | grep -q "$expected_string"; then
            echo -e "[${BOLD}${GREEN}Valid${RESET}] ${BOLD}$service_name${RESET}"
            if $SHOW_OUTPUT; then
                echo -e "    $output"
            fi
        else
            echo -e "[${BOLD}${RED}Invalid${RESET}] ${BOLD}$service_name${RESET}"
            if $SHOW_OUTPUT; then
                echo -e "    $output"
            fi
        fi
    fi
}

# ===========================
# Main Program
# ===========================
for entry in "${SERVICES[@]}"; do
    IFS=";" read -r service_name check_command expected_string <<< "$entry"
    check_service "$service_name" "$check_command" "$expected_string"
done