Tag Archive | mqconfig

Mqconfig: Check Kernal Parameter needs for MQ

The mqconfig command is run to verify the system configuration matches or exceeds that which is required by IBM MQ. The configuration values are minimum values, and large installations might require values greater than those checked by this command.

1) When i ran mqconfig before Installing MQ ,  these were the failures for the Kernal Paramater

2) You need to modify these Parameters which are failed

Run the below commands to check the values of the Semaphores paramaters

a) These parameters can only be changed with a root or a superuser .
b) These changes also may affect the other applications which are running on that Node. These needs to be concurred by the other application owners if any
#cat /proc/sys/kernel/shmmni
#cat /proc/sys/kernel/shmall
#cat /proc/sys/kernel/shmmax
#cat /proc/sys/kernel/sem
#cat /proc/sys/fs/file-max

For eg
3) To Modify these values as per the MQ recommendations , Log on as a user with root authority.

4) Open the file /etc/sysctl.conf with a text editor, then add or change the following entries to the values shown
a ) #vi /etc/sysctl.conf
b) Enter the below parameters in this file and Save and Exit
kernel.shmmni = 4096
kernel.shmall = 2097152
kernel.shmmax = 268435456
kernel.sem = 500 256000 250 1024
fs.file-max = 524288

c) To load these sysctl values immediately, enter the command
#sysctl -p
4) Maximum open files : ie “nofiles
If the system is heavily loaded, you might need to increase the maximum possible number of open files.
Issuing the following command to check the current set value
cat /proc/sys/fs/file-max

a) Edit the /etc/security/limits.conf files
b) Add the below values in the limits.conf
mqm soft nofile 10240
mqm hard nofile 10240

5) Maximum Process : ie “nproc
a) A running WebSphere MQ queue manager consists of a number of thread programs, and each connected application will increase the number of threads running in the queue manager processes.
b)  You should ensure that the maximum number of processes which the mqm user is allowed to run is not restricted .
c) Set
nproc for the mqm user to 4090 or more.
d) Edit the /etc/security/limits.d/90-nproc.conf to increase the nproc limit for all users .You can also set it for specific user too ..
mqm soft nproc 4090

6) ReRun the mqconfig.sh to check the all the kernal paramaters are Passed


7) Once all the paramaters are sucessful you could proceed with the installation of the MQ on these nodes

NOTE : These are the basic kernal values you need for MQ . But these may vary based on your application load and usage . So you may have to do a Trial and Error method to arrive at an appropriate value . but in most of the cases these values suffice





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Websphere MQ 7.5 Installation on Linux

Steps to Install MQ 7.5 on Linux

1) Ensure that all the prerequisites are validated and checked before downloading and installing it
2) Recommended to create two partitions for the Installation and the Data filesystem ( ie /opt/mqm and /var/mqm)
3) Its Important to check/modify  the kernal parameters for the Unix using the mqconfig.sh. I have created a Post for this  . You can refer to the Link  HERE

The current mqconfig.sh output before installation ( i have done the  necessary changes in linux kernal parameters)


All are PASSED

NOTE: These values may differ based on large setup , load etc 

4) Download the MQ setup from the Passport Advantage
5) I have saved the setup  WS_MQ_LINUX_ON_X86_32B_V7.5.0.2.tar     in /IBMSoftware/MQLinux_7.5


6) Extract the tar file in the same location using tar -xvf command

7) The tar file consists of the rpms for MQ and other supporting packages for it

8) Check if MQ is already installed using rpm command : rpm -qa | grep -i mq
9) Login as root or any super user

a) Create the mqm user and mqm groups using the Unix commands
#groupadd mqm 

#useradd -g mqm mqm 
b) Execute the “ ./mqlicense.sh” script to accept the License .
Press Enter , Enter to go to the last of the License Agreement

Enter “ 1” to accept the license

NOTE : If you don’t accept the License and try to install the rpms you will receive the below error
Product cannot be installed until the license agreement has been accepted

10) Run the rpm command to install the MQ rpms
ie rpm -ivh < rpm package name >;

You can simply run “ rpm -ivh *.rpm” from the folder where the MQsetup Tar was extracted . In my case its /IBMSoftware/MQLinux_7.5

a) “rpm -ivh *.rpm” will take care of the dependencies between the rpms .
Alternatively you could run individual rpms 

[root@mercury MQLinux_7.5]# rpm -ivh MQSeriesServer-7.5.0-2.i386.rpm

b) Also below are the sequence of the dependencies which needs to be followed if individually installing the rpms

NOTE: Running these rpms will create the user mqm and the group mqm with user mqm as it member if the users are not allready created 

11) Check if MQ is installed properly . you can use rpm -qa | grep -i MQ to check the rpms installed

a) Use rpm -qi MQSeriesServer-7.5.0-2  to get more information on the specific package like versions , path of installation , license etc.

12) Navigate to the locations /opt/mqm and /var/mqm and validate the permissions . It should be mqm

13) Check the users and group mqm creation


14) Switch user to mqm using su – mqm
a) # su – mqm
b) Load the environment variable for MQ using setmqenv
$. /opt/mqm/bin/setmqenv

NOTE: a) You can Ignore the message AMQ8588
b) Also you can add “. /opt/mqm/bin/setmqenv ” in the .bash_profile file of                                   the 
user  to load the Env Variables every time automatically when logging in.

15 ) Validate the versions of MQ execute “dspmqver” as mqm user

Here its with “Installation Path” as /opt/mqm and “Data Path” as /var/mqm

16 ) You could create some test Queue Managers to validate the installation too ( i will write a separate post for the Queue Manager creation )

This is how we install the MQ on a Linux Server .



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