The apache server logs the access requests in /var/log/apache2 so we can analyse this log file to find out the last few requests.
The following parses the apache2 server logs, and print the requests line by line. It is based on the BASH commands: awk and tail.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/bin/bash NUMBER_OF_REQUESTS=50 LOG_FILES_PREFIX=/var/log/apache2/access tail -n $NUMBER_OF_REQUESTS $LOG_FILES_PREFIX* | awk -F'"' ' # Ensure the IP address, request, and user agent fields are present $1 ~ /^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ && $2 ~ /^(GET|POST|HEAD|PUT|DELETE|OPTIONS|PATCH)/ && $6 != "" { split($1, part1, " ") ip = part1[1] split($2, request, " ") method = request[1] path = request[2] user_agent = $6 print ip, path, user_agent } ' |
#!/bin/bash
NUMBER_OF_REQUESTS=50
LOG_FILES_PREFIX=/var/log/apache2/access
tail -n $NUMBER_OF_REQUESTS $LOG_FILES_PREFIX* | awk -F'"' '
# Ensure the IP address, request, and user agent fields are present
$1 ~ /^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/ && $2 ~ /^(GET|POST|HEAD|PUT|DELETE|OPTIONS|PATCH)/ && $6 != "" {
split($1, part1, " ")
ip = part1[1]
split($2, request, " ")
method = request[1]
path = request[2]
user_agent = $6
print ip, path, user_agent
}
'Example output (each line containing the IP Address, URI/URL, and User Agent):
Last Few Requests to Apache2 by IP, URL and User Agent
With this, we can integrate to the BASH script that sends an email notification when CPU load average is high, to help us understand what cause(s) the spike.
–EOF (The Ultimate Computing & Technology Blog) —
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