This post is written by: Leonardo Azize Martins, Cloud Infrastructure Architect, Professional ServicesĬustomers often use Amazon Elastic Compute Cloud (Amazon EC2) Linux based instances with many Amazon Elastic Block Store (Amazon EBS) volumes attached. In this case, device name can vary depending on some facts, such as virtualization type, instance type, or operating system. As the device name can change, the customer shouldn’t rely on the device name to mount volumes from it. The customer wants to avoid the situation where a volume is mounted on a different mount point just because the device name changed, or the device name doesn’t exist because the name pattern changed.Ĭustomers who want to utilize the latest instance family usually change the instance type when a new one is available. The device name can be different between instance families, such as T2 and T3. T2 uses /dev/sd, while T3 uses /dev/nvmen1. If you mount a device on T2 called /dev/sdc, when you change the instance family to T3 the same device won’t be called /dev/sdc anymore. In this case, it will fail to mount.Īmazon EBS volumes are exposed as NVMe block devices on instances built on the AWS Nitro System.
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The block device driver can assign NVMe device names in a different order than what you specified for the volumes in the block device mapping. #KITEMATIC AUTOMATICALLY ADD LOCAL FOLDER FOR VOLUMES DRIVER# In this situation, a device that should be mounted on /data could end-up being mounted on /logs. On Linux, you can use the fstab file to mount devices using kernel name descriptors (the traditional way), file system labels, or the file system UUID.
#Kitematic wikipedia software#
Kernel name descriptors aren’t persistent and can change each boot. Magic Fortmatic was founded in 2018 by Sean Li also founder of software solution Kitematic, and former product lead at app-development company Docker (. Therefore, they shouldn’t be used in configuration files. UUID is a mechanism for giving each filesystem a unique identifier. These identifiers’ attributes are generated by filesystem utilities (mkfs.*) when the device is formatted, and they’re designed so that collisions are unlikely. An example is the simple open chain formed by links connected in series, like the usual chain, which is the kinematic model for a typical robot manipulator. As in the familiar use of the word chain, the rigid bodies, or links, are constrained by their connections to other links.
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