deliverables for 'investigate system status'

investigate_system_status/exporter.sh

+#!/usr/bin/env bash
+
+
+TMP_METRICS_WEB_DIR=$(mktemp -d)
+LISTENING_PORT=3000
+
+
+
+function getTotalInboundTraffic(){
+    local receivedBytes=0
+    local networkDevices=$(ls /sys/class/net/ | grep -v lo)
+
+    local bytesBefore=0
+    for device in ${networkDevices}; do
+        local bytesOnDevice=$(cat /sys/class/net/${device}/statistics/rx_bytes)
+        bytesBefore=$((${bytesBefore} + ${bytesOnDevice}))
+    done
+
+    sleep 1
+
+    local bytesAfter=0
+    for device in ${networkDevices}; do
+        local bytesOnDevice=$(cat /sys/class/net/${device}/statistics/rx_bytes)
+        bytesAfter=$((${bytesAfter} + ${bytesOnDevice}))
+    done
+
+    receivedBytes=$((${bytesAfter} - ${bytesBefore}))
+    echo "${receivedBytes}"
+}
+
+
+function getTotalCountOfProcesses(){
+    local processCount=0
+    processCount=$(ps aux | wc -l)
+    echo "${processCount}"
+}
+
+
+function getTotalMemoryUsage(){
+    local memoryInKibibytes=0
+    memoryInKibibytes=$(free -k | grep Mem | awk -F " " '{ print $2}')
+    echo "${memoryInKibibytes}"
+}
+
+
+function getTotalUptime(){
+    local uptimeInSeconds=0
+    uptimeInSeconds=$(cat /proc/uptime | awk -F " " '{ print $1}')
+    echo ""${uptimeInSeconds}""
+}
+
+
+
+# Replace file content after every sleep cycle
+( while true; do
+
+    printf "%s\n" \
+        "# HELP process_count_total Amount of running processes" \
+        "# TYPE process_count_total gauge" \
+        "process_count_total $(getTotalCountOfProcesses)" \
+        "" \
+        "# HELP memory_utilization_total_kib Amount of currently used memory" \
+        "# TYPE memory_utilization_total_kib gauge" \
+        "memory_utilization_total_kib $(getTotalMemoryUsage)" \
+        "" \
+        "# HELP uptime_total_seconds Amount of time the system is running already" \
+        "# TYPE uptime_total_seconds counter" \
+        "uptime_total_seconds $(getTotalUptime)" \
+        "" \
+        "# HELP traffic_inbound_total_bytes_per_second Amount of receiving traffic within a second across all network interfaces, except lo" \
+        "# TYPE traffic_inbound_total_bytes_per_second gauge" \
+        "traffic_inbound_total_bytes_per_second $(getTotalInboundTraffic)" \
+    > "${TMP_METRICS_WEB_DIR}/index.html"
+
+    sleep 3;
+
+done ) & PIDS[1]=$!
+
+
+# Start web server to serve metrics file
+( python3 -m http.server \
+    --bind 0.0.0.0 \
+    --directory "${TMP_METRICS_WEB_DIR}" \
+    "${LISTENING_PORT}"
+) & PIDS[2]=$!
+
+
+
+function quit(){
+    for PID in ${PIDS[*]}; do kill -s SIGTERM ${PID}; done;
+    rm -rf "${TMP_METRICS_WEB_DIR}"
+    exit 0
+}
+
+trap quit SIGINT SIGTERM
+
+wait
\ No newline at end of file

investigate_system_status/terminal.log

+bj@Bjarnes-Laptop:~/DevOps/tutorials/webservice/investigate_system_status$ dir
+exporter.sh
+bj@Bjarnes-Laptop:~/DevOps/tutorials/webservice/investigate_system_status$ chmod +x exporter.sh
+bj@Bjarnes-Laptop:~/DevOps/tutorials/webservice/investigate_system_status$ chmod +x /DevOps/tutorial_webservice/investigate_system_status/exporter.sh ^C
+bj@Bjarnes-Laptop:~/DevOps/tutorials/webservice/investigate_system_status$ ./exporter.sh
+Serving HTTP on 0.0.0.0 port 3000 (http://0.0.0.0:3000/) ...
+127.0.0.1 - - [28/Jul/2024 18:46:28] "GET / HTTP/1.1" 200 -
+127.0.0.1 - - [28/Jul/2024 18:46:28] code 404, message File not found
+127.0.0.1 - - [28/Jul/2024 18:46:28] "GET /favicon.ico HTTP/1.1" 404 -
+^C
+Keyboard interrupt received, exiting.
+bj@Bjarnes-Laptop:~/DevOps/tutorials/webservice/investigate_system_status$
+
+Browser (localhost:3000):
+# HELP process_count_total Amount of running processes # TYPE process_count_total gauge process_count_total 100 # HELP memory_utilization_total_kib Amount of currently used memory # TYPE memory_utilization_total_kib gauge memory_utilization_total_kib 3941156 # HELP uptime_total_seconds Amount of time the system is running already # TYPE uptime_total_seconds counter uptime_total_seconds 4479.20 # HELP traffic_inbound_total_bytes_per_second Amount of receiving traffic within a second across all network interfaces, except lo # TYPE traffic_inbound_total_bytes_per_second gauge traffic_inbound_total_bytes_per_second 66