configure: error: Please reinstall the BZip2 distribution

configure: error: Please reinstall the BZip2 distribution

If you find this error in CentOS, Fedora or RHEL, Run

# yum install bzip2-devel

If you find this error in Ubuntu or Debian, Run

# apt-get install libbz2-dev

Linux CPU / Memory Utilization and other Performance

Linux CPU Load

If you want to see the CPU Load details as well CPU utilization, try following command.

# top

Press q to return on command prompt. q is for quit.

or more graphical representation

# htop

Press q to return on command prompt. q is for quit.

or Install sysstat & try following command :

# mpstat

You can see CPU usage in percentage using

# sar

as well as you can use

# iostat

If you want to know who is eating cpu

# ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10

Web Server Monitoring Tools

WebSite Monitoring Tools

Nagios : Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

WebSitePulse : The WebSitePulse Website monitoring service provides 24/7 mission-critical remote availability monitoring and performance measurement of your website from end-user perspective. With two service options, Performance website monitoring simulating repeat user and Full-page website monitoring, simulating first-time user experience, this monitoring service gives you real insight into what your end-users are experiencing with your website.

InternetSupervision : InternetSupervision.com monitors the availability, performance, and content of your website, web server and internet services from our UL approved offices with 24/7 personnel in Washington DC, Detroit, Chicago, Los Angeles, and Santiago, Chile. We also have remote check points in Gloucester, UK, and Sydney, Australia. Learn more about our services and plan pricing.

site24x7 : Keep track of the performance of multi-step web applications or business transactions. It can remotely monitor the availability and performance of business-critical web applications that involves multiple web transactions.

hosttracker : They provide Monitoring an unlimited number of resources, Distributed monitoring, Monitoring period – every 1/5/15/30/60 minutes, Possible monitoring of CGI scripts’ operation, The HEAD/POST/GET HTTP-methods support, Ability to specify parameters passed to a CGI script, Keyword presence control on a page and many more.

Pingdom : Pingdom makes it easy for user to monitor the uptime and performance of the website or server.

monitor.us : They provide Tracking website availability and performance from different locations in major countries and traffic destinations, Website uptime checks,  using HTTP, HTTPS, PING, DNS, Agentless MySQL checks, Email checks using SMTP, POP3, IMAP protocols, Public IP checks using TCP, UDP, SSH and IMCP protocols, VoIP checks using SIP protocol, Webpage content checks, Instant failure alerts via email, IM, SMS or live voice, SLA Reporting - detailed reporting with service level metrics per interval and many more.

Are my sites up : It is a free, ad-supported web server monitoring tool. Their plans will check the sites as frequently as once per minute. User get unlimited email and SMS notifications (in the US, International SMS is available) and they tell user that why was down by providing the HTML status error code, when possible. They provide an iPhone application, RSS feeds, webhooks, keyword search, premium-level support, email notifications to multiple addresses, multiple user accounts voice calls.

Observu : Observu monitors your websites from multiple locations and combines it with measurements collected on your servers. Notification by E-mail, SMS and Voice calls will allow you to respond quickly and improve your quality of service dramatically.

ServiceUptime : Free monitoring account includes one monitoring service (any port or service) checked every 30 minutes. Free account has all necessary features to keep the track of your website uptime and is limited in some advanced features and check frequency only. There is no limitations on worldwide locations so your service will be monitored from all over the world. 

Montastic : Montastic monitors the sites and alert when there is an error. They send an email when the site goes down as well as when the site goes back up. They read statuses via RSS, Mac, PC, Android widgets and API .They support for HTTP, HTTPs and any port number and HTTP authentication. They verify presence or absence of keyword on a web page Monitoring frequency up to every 5 minutes.

BasicState : It is a free web site uptime monitor service, server and network failure alerts.  The free uptime monitoring service monitors http services. The test attempts to retrieve the home page at a fixed interval of fifteen minutes. For additional capabilities exactstate.com offers http, https, smtp, imap, pop3, ftp, ssh, telnet and custom tcp ports at intervals between 1 to 20 minutes. Email blacklist monitoring of dnsbl blacklists and rhsdnsbl blacklists is also available for both individual servers and bulk ip address netblocks. Be sure to check out the 2 for 1 bonus offer before deciding on your first purchase.