Google cloud instances run on top of KVM hypervisor. In newer KVM versions, such as the one used in Google Cloud, virtio-scsi is used instead of an older virtio-blk storage backend. The virtio-scsi disk devices looks like: In RHEL6, a module…Read More >
Lift and shift migration using tools like Cloudendure is the fastest way to migrate ‘on premises’ systems to Google Cloud. When the migration is complete, the environment can be refactored to use cloud-native capabilities. During application testing after a recent automated…Read More >
In the TICK stack from influxdata , Telegraf is used to collect and send data to influxdb. Metrics in Influxdb can then be viewed using visualization tools like Grafana. There are several input and output plugins for telegraf, which can…Read More >
Minto Joseph explains how to run logstash in Amazon EC2 Container Service.Read More >
The behavior of vm.swappiness was always a bit confusing for novice linux users, as setting vm.swappiness to 0 would not completely disable swapping in the system during a memory crunch. vm.swappiness would only affect the agressiveness of swapping. Following upstream…Read More >
Minto Joseph, Site Reliability Consultant at Pythian, explains how to encrypting sensitive data in puppet using hiera-eyaml.Read More >
Minto Joseph, Site Reliability Consultant at Pythian, details his experience debugging Kibana using Chrome developer tools.Read More >
Nagios authentication with Active Directory aligns with user management consolidation policies in most organizations. This post explains how to setup Nagios authentication with Active Directory, while using Apache as web server. mod_authz_ldap is an apache LDAP authorization module. This can…Read More >
The fsfreeze command, is used to suspend and resume access to a file system. This allows consistent snapshots to be taken of the filesystem. fsfreeze supports Ext3/4, ReiserFS, JFS and XFS. A filesystem can be frozen using following command: #…Read More >
strace is a very useful tool which traces system calls and signals for a running process. This helps a lot while debugging application level performance issues and bugs. Aim of this post is to demonstrate the power of strace in…Read More >
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