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Steps to mount locally *.img disk (SD card) image file: #analyze image losetup -P /dev/loop0 raspbian.img #list available partitions ls -lht /dev/loop* #mount partitions mount /dev/loop0p2 /mnt mount /dev/loop0p1 /mnt/boot
To resize partition and XFS file system under Linux OS after physical/virtual disk resize: #check current storage layout lsblk #resize "1" partition on /dev/vda disk device growpart /dev/vda 1 #resize XFS file system xfs_growfs /dev/vda1
Check CPU Vulnerabilities under Linux cat /sys/devices/system/cpu/vulnerabilities/spectre_v2 cat /sys/devices/system/cpu/vulnerabilities/l1tf cat /sys/devices/system/cpu/vulnerabilities/spec_store_bypass cat /sys/devices/system/cpu/vulnerabilities/spectre_v1 cat /sys/devices/system/cpu/vulnerabilities/meltdown
Generate 32 bytes, hex encode: openssl rand -hex 32 Generate 32 bytes, base64 encode: openssl rand -base64 32 Generate 32 bytes, save output to file: openssl rand -out file.txt 32
Analyze boot time: systemd-analyze Find long booting services: systemd-analyze blame Plot SVG chart of boot process timeline: systemd-analyze plot > tmp.svg Critical chain: systemd-analyze critical-chain Analyze logs from particular service i.e. networking.service journalctl -xe -u networking.service