Trainings

ELK Stack – Upgrade from 2.x to 5.x

Elasticsearch Snapshot and Restore https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html   Elasticsearch Migration Helper Plugin cd /usr/share/elasticsearch/ ./bin/plugin install https://github.com/elastic/elasticsearch-migration/releases/download/v2.0.4/elasticsearch-migration-2.0.4.zip you may get updated command from here -> Elasticsearch Migration Plugin Install You may download plugin from here -> Elasticsearch Migration Plugin After plugin install, access plugin using URL http://elasticsearch_ip:9200/_plugin/elasticsearch-migration/ netstat -na | egrep ‘9200|9300’ vi /etc/elasticsearch/elasticsearch.yml network.host: localhost   ...

Solaris OK prompt commands

OK show-disks  ——> To show the disks OK probe-scsi  ——> To search the scsi devices attached to the primary scsi controller OK probe-scsi-all —> To search all the scsi devices OK devalias   —-> to list device alias names OK devalias <alias> <path> —>To temporarily create a device alias OK printenv        ...

Asterisk Server Security – SIP security

If your SIP server is exposed to internet. Then you need to take some measure even if you have fail2ban installed. Fail2Ban keep track of the logs while blocking the attacks and some of the attacks might occur while fail2ban start jump into it. Following are the Tools used for that; sipsak sipvicious iWar...

DNS firewall – Its time to try DNS firewall

  https://www.isc.org/wp-content/uploads/2017/12/RPZ-webinar7.ppt.pdf Webinars and other Presentations given by ISC http://www.securityzones.net/images/downloads/Rackspace-RPZ-Case-Study.pdf https://kb.isc.org/article/AA-00525/110/%20Building-DNS-Firewalls-with-Response-Policy-Zones-RPZ.html http://www.securityzones.net/images/downloads/BIND_RPZ_Installation_Guide.pdf  ...

Web Server Performance Tuning

First off, Apache, nginx, or LightSpeed aside – if you’re running a server with 1000-2000 requests/second it’s time to start thinking about dual servers and load balancing. Depending on what you’re serving you can easily get more out of any of those servers, but at those rates you’re serving something important (or at least high-traffic), so...

top command on multi core processor

top command shows CPU usage as a percentage of a single CPU by default. That’s why you can have percentages that are >100. On a system with 4 physical or virtual cores, you can see up to 400% CPU usage. You can change this behavior by pressing I (that’s Shift + i and toggles “Irix...

Cisco – Trainings and Certifications

Cisco Trainings and Certifications overview Cloud CCNA Cloud CCNP Cloud Collaboration CCNA Collaboration CCNP Collaboration CCIE Collaboration Cybersecurity Operations CCNA Cyber Ops Data Center CCNA Data Center CCNP Data Center CCIE Data Center Design CCENT CCDA CCDP CCDE CCAr Industrial CCNA Industrial Routing and Switching CCENT CCNA Routing and Switching CCNP Routing and Switching...