Associate Elastic IP to EC2 Instance

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In this tutorial you will learn how to associate an Elastic static ip address to an  EC2 Instance. We already discussed how to setup an EC2 Instance and make sure the instance is running state.
                                                           
                                                            First login to your AWS management console and select EC2 option from your Amazon web services.Click on Elastic IPs from the left options. Before associate elasstic ip we need to allocate one first.Click on Allocate New Address . 



In the pop menu select EIP used in as EC2 or VPC as per your setup.Then click on Associate address to select the instance which you want to associate the IP Address.
                                                           

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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
configuration file ( /etc/default/dse ) and datasenter name was Solr. Now i tried to start the dse with graph enabled, which change the name to datacenter SearchGraph which is default workload type name.

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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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',
    logfile => '/var/logs/error.log',
    criticalpatterns => 'Error',
  }
);

Here i am filtering pattern "Error" from log file which i had mentioned in logfile parameter section


Configure nrpe.cfg in client system :

$ nano /etc/nagio…
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Popular posts from this blog

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

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Image
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configuration file ( /etc/default/dse ) and datasenter name was Solr. Now i tried to start the dse with graph enabled, which change the name to datacenter SearchGraph which is default workload type name.

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
Continue Reading »»»»

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

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Image
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-

Continue Reading »»»»

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',
    logfile => '/var/logs/error.log',
    criticalpatterns => 'Error',
  }
);

Here i am filtering pattern "Error" from log file which i had mentioned in logfile parameter section


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