Added new post

Author: PsCustomObject

_posts/2021-05-02-Write-Raspberry-Image-Command-Line.md

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+---
+title: "Write RaspBerry image to SD card via command line"
+excerpt: ""
+categories:
+  - Linux
+  - Azure
+
+tags:
+  - Linux
+  - Lab
+
+toc: true
+header:
+    teaser: "/assets/images/Kubernetes_Logo.png"
+---
+
+I am in the process of rebuilding my *Docker/Kubernetes* portable cluster which I build using a couple of RaspberryPi 4 and as part of this I needed to *reflash* the various SD cards where oeprating system for each node is installed.
+
+Usually [Balena Etcher](https://www.balena.io/etcher/) is my goto tool for such endavors but being in a rush and not easy way to download the tool on my Linux box I simply used the good old command line, here is how this is done.
+
+First of all we need to locate the device mapped to our SD card, in my case I'm using a microSD to USB adaapter, which can be done with the following command:
+
+```bash
+sudo fdisk -l
+
+Disk /dev/sda: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
+Disk model: WDC WD1003FZEX-0
+Units: sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 4096 bytes
+I/O size (minimum/optimal): 4096 bytes / 4096 bytes
+Disklabel type: dos
+Disk identifier: 0x806d3748
+
+Device     Boot      Start        End   Sectors   Size Id Type
+/dev/sda1  *          2048    1126399   1124352   549M  7 HPFS/NTFS/exFAT
+/dev/sda3       1024002048 1953519615 929517568 443.2G  7 HPFS/NTFS/exFAT
+
+
+Disk /dev/sdb: 465.76 GiB, 500107862016 bytes, 976773168 sectors
+Disk model: Samsung SSD 850 
+Units: sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 512 bytes
+I/O size (minimum/optimal): 512 bytes / 512 bytes
+Disklabel type: dos
+Disk identifier: 0xde0a016a
+
+Device     Boot   Start       End   Sectors   Size Id Type
+/dev/sdb1  *       2048   2099199   2097152     1G 83 Linux
+/dev/sdb2       2099200 976773119 974673920 464.8G 83 Linux
+
+<snip for brevity>
+
+Device     Boot  Start     End Sectors  Size Id Type
+/dev/sdd1  *      2048  526335  524288  256M  c W95 FAT32 (LBA)
+/dev/sdd2       526336 6819619 6293284    3G 83 Linux
+```
+
+In my case the SD card is mapped to device **/dev/sdd**, once we have found the device to use the following command:
+
+```bash
+xzcat ./ubuntu-21.04-preinstalled-server-arm64+raspi.img.xz | sudo dd bs=4M of=/dev/sdd conv=fsync
+0+425226 records in
+0+425226 records out
+3491662848 bytes (3.5 GB, 3.3 GiB) copied, 99.9634 s, 34.9 MB/s
+```
+
+In the above example I used **Ubuntu Server 21.04** as the operating system with the image file being stored in the same path where the command is being run but the same can be used with any other image file.
+
+I hope this can be useful and probably in the future I will post how to easily build a portable Docker/Kubernetes cluster lab.