Current Date to Filename in Bash Shell

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 To assign current date to file name use month,date,time format like 
 date +%m%d%y and if You want to assign the date value to a variable follow   
 the date syntax format

time=$(date +%m%d%y)
or
time=`date +%m%d%y`

Some sample Examples are given below

#!/bin/bash
time=$(date +%m%d%y)
echo “Backup file of $time”

#!/bin/bash
time=$(date +%m%d%y)
musqldumb -u root -ppassword databasename > database_$time.sql

#!/bin/bash
time=$(date +%m%d%y)
mv /var/www/filename /home/sreeraju/
cd /home/sreeraju/
tar -cvf backup_$time.tar filename

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Datastax Error : Cannot start node if snitch's data center (dc1) differs from previous data center (dc2)

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This error occurs when the node try to start and see it has snitch information which differ from previous data center. In my case, i was using DseSimpleSnitch which name the datacenter based on workload type. Previously i had enabled solr in dse default
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CassandraDaemon.java:698 - Cannot start node if snitch's data center (Solr) differs from previous data center (SearchGraph). Please fix the snitch configuration, decommission and rebootstrap this node or use the flag -Dcassandra.ignore_dc=true

Solution :

1) In the last line of cassandra-env.sh set in the jvm opts as given below :
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Datastax Error : Cassandra - Saved cluster name Test Cluster != configured name

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While changing existing cluster name in datastax, i got name mismatch exception in log file. Process i followed was changed the cluster name in cassandra.yaml configuration file.

$ nano /etc/dse/cassandra/cassandra.yaml

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Solution : 


Change the cluster name  to "New Cluster Name" :

$ cqlsh `hostname -I`

cqlsh> UPDATE system.local SET cluster_name = 'New Cluster Name' where key='local';
cqlsh> exit;

$ nodetool flush system

Stop the cluster :

$ sudo service dse stop;sudo service datastax-agent stop

Edit the file :

$ sudo vi /etc/dse/cassandra/cassandra.yaml
cluster_name: 'New Cluster Name'

Start the cluster :

$ sudo service dse start;sudo service datastax-agent start

Check Installation log :

 $ cat /var/log/cassandra/output.log


Reference  : https://support.datastax.com/hc/en-us/articles/205289825-Change-Cluster-Name-

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Configure Nagios plugin " check_logfiles " for scanning log file

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I was checking for a nagios plugin which could filter the specified log file which i had mentioned and notify me whenever a warning or error appeared in log. Finally i get in hand check_logfilecreated by Gerhard Lausser. Check_logfiles is used to scan the lines of a file for regular expressions.

Install the plugin on client system : 

$ wget https://labs.consol.de/assets/downloads/nagios/check_logfiles-3.8.0.2.tar.gz

$ tar xvzf check_logfiles-3.8.0.2.tar.gz

$ cd check_logfiles-3.8.0.2/

$ ./configure

$ make

$ make install

check_logfiles executable file will get installed on location "/usr/local/nagios/libexec"


Configure Check Pattern :

$ nano  /etc/nagios-plugins/config/check_log.cfg

@searches = (
  {
    tag => 'Error',
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    criticalpatterns => 'Error',
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CassandraDaemon.java:698 - Cannot start node if snitch's data center (Solr) differs from previous data center (SearchGraph). Please fix the snitch configuration, decommission and rebootstrap this node or use the flag -Dcassandra.ignore_dc=true

Solution :

1) In the last line of cassandra-env.sh set in the jvm opts as given below :
JVM_OPTS="$JVM_OPTS -Dcassandra.ignore_dc=true"
2) If it starts successfully, execute:

nodetool repair nodetool cleanup
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Datastax Error : Cassandra - Saved cluster name Test Cluster != configured name

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While changing existing cluster name in datastax, i got name mismatch exception in log file. Process i followed was changed the cluster name in cassandra.yaml configuration file.

$ nano /etc/dse/cassandra/cassandra.yaml

cluster_name: 'Test Cluster1'








Solution : 


Change the cluster name  to "New Cluster Name" :

$ cqlsh `hostname -I`

cqlsh> UPDATE system.local SET cluster_name = 'New Cluster Name' where key='local';
cqlsh> exit;

$ nodetool flush system

Stop the cluster :

$ sudo service dse stop;sudo service datastax-agent stop

Edit the file :

$ sudo vi /etc/dse/cassandra/cassandra.yaml
cluster_name: 'New Cluster Name'

Start the cluster :

$ sudo service dse start;sudo service datastax-agent start

Check Installation log :

 $ cat /var/log/cassandra/output.log


Reference  : https://support.datastax.com/hc/en-us/articles/205289825-Change-Cluster-Name-

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Install the plugin on client system : 

$ wget https://labs.consol.de/assets/downloads/nagios/check_logfiles-3.8.0.2.tar.gz

$ tar xvzf check_logfiles-3.8.0.2.tar.gz

$ cd check_logfiles-3.8.0.2/

$ ./configure

$ make

$ make install

check_logfiles executable file will get installed on location "/usr/local/nagios/libexec"


Configure Check Pattern :

$ nano  /etc/nagios-plugins/config/check_log.cfg

@searches = (
  {
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    logfile => '/var/logs/error.log',
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