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FAQ for the 'Monitoring' Category

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• Exim Remove All messages From the Mail Queue
  

  Question: I’m using Exim mail server under CentOS Linux. How do I remove all messages from the Exim mail queue using a shell prompt?

• How To Reuse SSH Connection To Speed Up Remote Login Process
  

  Q. How do I reuse same ssh connection to speed up remote login procedure with OpenSSH client?

• psad: Linux Detect And Block Port Scan Attacks In Real Time
  

  Q. How do I detect port scan attacks by analyzing Debian Linux firewall log files and block port scans in real time? How do I detect suspicious network traffic under Linux?

• dnstop: Monitor BIND DNS Server (DNS Network Traffic) From a Shell Prompt
  

  Q. How do I monitor my Bind 9 named (or any other dns server) server traffic / network traffic under Linux? How do I find out and view current DNS queries such as A, MX, PTR and so on in real time? How do I find out who is querying my DNS server or specific domain or specific dns client IP address?

• Install ntop on Red Hat Enterprise Linux / CentOS Linux

  ntop is a network probe that shows network usage in a way similar to what top does for processes. How do I install latest version of ntop on RHEL / CentOS Linux 5.x systems?

• FreeBSD Install lsof To Displays Information About Files Open to Unix processes

  How do I install the free, open-source, Unix administrative tool called lsof (for LiSt Open Files) under FreeBSD operating system to displays information about files open to Unix processes?

• Debian / Ubuntu Linux Install ntop To See Network Usage / Network Status

  How do I track my network usage (network usage monitoring) and protocol wise distribution of traffic under Debian Linux? How do I get a complete picture of network activity?

• Throttle The Disk I/O Rate: Limit disk I/O for rsync Tool

  I run a backup script called /root/backup.sh which runs rsync command. However, rsync makes a lots of disk I/O and network I/O. I’d like to reduce both disk I/O and network I/O. I’ve 10Mbps server connection and 160GiB SATA hard disk. How do reduce disk I/O so that the entire system doesn’t die or become unresponsive?

• Debian / Ubuntu Linux: Send Automatic Email Notification When Security Upgrades Available

  How do I force apt-get to send me email when upgrades or security updates available under Debian or Ubuntu Linux? Do I need to write a shell script which generates a mail with a list of all packages currently pending an upgrade?

• Linux Check Health of 3ware RAID Array

  How do I check the health of my 3ware RAID array under any Linux distribution? How do I access 3ware RAID Array web interface?

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