Friday, November 25, 2016

Random sleep in bash script

Random sleep in bash script


To insert a random sleep into a running script:

 sleep $[ ( $RANDOM % 10 )  + 1 ]s

 
This will introduce a 1-10 second random sleep in the script. 

Wednesday, November 16, 2016

Glassfish 4.1 admin reset password

Glassfish 4.1 admin reset password

1. Go to
 /opt/glassfish4/glassfish/domains/domain1/config/local_password 
its contents are a backup password to log in as admin

2. You can replace the domain\config\admin-keyfile contents with the following:

admin;{SSHA256}UV9EsTaoxzAdtxiNMKTkb3g0WjnoUBEBgpDQIGSdOu8QhprFoWiSCw==;asadmin

This will give you a username of 'admin' and password 'changeit'.


Thursday, November 10, 2016

NFS, Centos 7, firewalld setup


NFS, Centos 7, firewalld setup

On server
systemctl enable rpcbind
systemctl enable nfs-server
systemctl enable nfs-lock
systemctl enable nfs-idmap

systemctl start rpcbind
systemctl start nfs-server
systemctl start nfs-lock
systemctl start nfs-idmap

edit  /etc/exports

/media/USB-drive/ 192.168.200.2(rw,sync,no_root_squash,no_all_squash)
(path do shared folder, IP of client, permissions and configs)

firewall-cmd --permanent --add-service=nfs
firewall-cmd --permanent --add-service=mountd
firewall-cmd --permanent --add-service=rpc-bind
firewall-cmd --reload
 
to check if everything is correct
exportfs 
 
from client mount the nfs share
create folder
/mnt/nfs/USB-drive  
 
mount -t nfs 192.168.200.1:/media/USB-drive /mnt/nfs/USB-drive 

Tuesday, November 8, 2016

How to test NFS speed or HDD speed

How to test NFS speed or HDD speed

> hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   24960 MB in  2.00 seconds = 18504.33 MB/sec
 Timing buffered disk reads: 6746 MB in  3.00 seconds = 4247.95 MB/sec

for more reliable outcome

for i in 1 2 3; do hdparm -tT /dev/sda; done


or

>dd if=/dev/zero of=/tmp/output.img bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 0.873801 s, 2.5 GB/s
 


NFS:

at first create test folder 

> bonnie+++ -d /mnt/nfs/test/ -u root

to see some human readable report

bonnie++ -d /mnt/nfs/test/ -r 2048 -u root | bon_csv2html > /root/bonnietest.html




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