From 65487c14eca1f942975ebb0bdaebef2519bf45fc Mon Sep 17 00:00:00 2001
From: Stefan Huber <shuber@sthu.org>
Date: Tue, 9 Apr 2013 07:44:41 +0200
Subject: [PATCH] Add a simple script that checks some VPS parameters

---
 checkserver.sh | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100755 checkserver.sh

diff --git a/checkserver.sh b/checkserver.sh
new file mode 100755
index 0000000..937b336
--- /dev/null
+++ b/checkserver.sh
@@ -0,0 +1,98 @@
+#!/bin/sh
+
+failed() {
+	echo "$@" >&2
+	exit 1
+}
+
+log() {
+	[ "$VERBOSE" = "1" ] && echo "$@"
+}
+
+checkDNS() {
+	log "Check DNS lookup for '$1'."
+	if ! host "$1" 8.8.8.8 > /dev/null; then
+		failed "DNS lookup at 8.8.8.8 for '$1' failed."
+	fi
+}
+
+checkWebserver() {
+	log "Check web server at '$1'."
+	if ! curl -s "$1" > /dev/null; then
+		failed "Failed to retrieve website '$1'."
+	fi
+}
+
+checkMailserver() {
+	log "Check mail server at '$1'."
+	if ! echo "quit" | nc "$1" 587 | grep -m1 "^220 $1" > /dev/null; then
+		failed "Checking mail server '$1' failed."
+	fi
+}
+
+checkDiskfilling() {
+	log "Check disk filling at '$1'."
+	DF=$(ssh aristoteles.sthu.org "df -h | grep /$ | grep -o '[0-9]*%' | head -c -2")
+	if [ -n "$DF" ] && ! [ $DF -lt 80 ]; then
+		failed "Checking disk filling at '$1' failed."
+	fi
+}
+
+checkInternet() {
+	sleep 10
+	if ! host 8.8.8.8 8.8.8.8 > /dev/null; then
+		log "We do not appear to be connected to the internet."
+		exit 0
+	fi
+}
+
+
+usage() {
+	cat << EOF
+Usage:
+ $0 [OPTIONS]
+ $0 -h
+
+OPTIONS:
+  -h            Show this text.
+  -v            Print verbose output.
+  -a ADDRESS    Check DNS (reverse) lookup.
+  -w ADDRESS    Check webserver.
+  -m ADDRESS    Check mailserver.
+  -d ADDRESS    Check disk filling.
+EOF
+}
+
+source $HOME/.profile-sshagent
+VERBOSE=1
+checkInternet
+
+VERBOSE=0
+while getopts "vha:w:m:d:" OPTION; do
+
+	case "$OPTION" in
+		h)
+			usage
+			exit
+			;;
+		v)
+			VERBOSE=1
+			;;
+		a)
+			checkDNS $OPTARG
+			;;
+		w)
+			checkWebserver $OPTARG
+			;;
+		m)
+			checkMailserver $OPTARG
+			;;
+		d)
+			checkDiskfilling $OPTARG
+			;;
+	esac
+done
+
+
+
+
-- 
2.39.5