Install MySQL Enterprise Monitor

1 . Install MySQL Monitor center

[root@Kilo-MySQL-Monitor ~]# unzip V790192-01-MySQL_Enterprise_Monitor_Service_Manager_3.3.1.zip

Archive:  V790192-01-MySQL_Enterprise_Monitor_Service_Manager_3.3.1.zip

 inflating: mysqlmonitor-3.3.1.1112-linux-x86_64-installer.bin  

 inflating: mysqlmonitor-3.3.1.1112-linux-x86_64-update-installer.bin  

 inflating: README_en.txt           

 inflating: READ_ME_ja.txt         

[root@Kilo-MySQL-Monitor ~]# chmod +x mysqlmonitor-3.3.1.1112-linux-x86_64-installer.bin

[root@Kilo-MySQL-Monitor ~]# ./mysqlmonitor-3.3.1.1112-linux-x86_64-installer.bin --mode text

Language Selection

Install HP ArcSight

[root@Kilo~]# useradd kilo_arc

[root@Kilo~]# vim /etc/security/limits.d/90-nproc.conf

    # Default limit for number of user's processes to prevent

    # accidental fork bombs.

    # See rhbz #432903 for reasoning.

    * soft nproc 1024

    root soft nproc unlimited

    * soft nproc 10240

Linux ss command to monitor network connections

ss - socket statistics

In a previous tutorial we saw how to use the netstat command to get statistics on network/socket connections. However the netstat command has long been deprecated and replaced by the ss command from the iproute suite of tools.

The ss command is capable of showing more information than the netstat and is faster. The netstat command reads various /proc files to gather information. However this approach falls weak when there are lots of connections to display. This makes it slower.
The ss command gets its information directly from kernel space. The options used with the ss commands are very similar to netstat making it an easy replacement.

Linux netstat command

1. List out all connections

The first and most simple command is to list out all the current connections. Simply run the netstat command with the a option.

$ netstat -a

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 enlightened:domain      *:*                     LISTEN     
tcp        0      0 localhost:ipp           *:*                     LISTEN     
tcp        0      0 enlightened.local:54750 li240-5.members.li:http ESTABLISHED
tcp        0      0 enlightened.local:49980 del01s07-in-f14.1:https ESTABLISHED
tcp6       0      0 ip6-localhost:ipp       [::]:*                  LISTEN     
udp        0      0 enlightened:domain      *:*                                
udp        0      0 *:bootpc                *:*                                
udp        0      0 enlightened.local:ntp   *:*                                
udp        0      0 localhost:ntp           *:*     

18 commands to monitor network bandwidth on Linux server

Network monitoring on Linux

This post mentions some linux command line tools that can be used to monitor the network usage. These tools monitor the traffic flowing through network interfaces and measure the speed at which data is currently being transferred. Incoming and outgoing traffic is shown separately.

Some of the commands, show the bandwidth used by individual processes. This makes it easy to detect a process that is overusing network bandwidth.
The tools have different mechanisms of generating the traffic report. Some of the tools like nload read the "/proc/net/dev" file to get traffic stats, whereas some tools use the pcap library to capture all packets and then calculate the total size to estimate the traffic load.
Here is a list of the commands, sorted by their features.

1. Overall bandwidth - nload, bmon, slurm, bwm-ng, cbm, speedometer, netload

2. Overall bandwidth (batch style output) - vnstat, ifstat, dstat, collectl

2. Bandwidth per socket connection - iftop, iptraf, tcptrack, pktstat, netwatch, trafshow

3. Bandwidth per process - nethogs