VirtualTam's bookmarks

  1. /r/golang | Learning Distributed systems
    2019-09-16
    data distributed distributed-system/cluster network programming programming/go
    Permalink
  2. inventaire: a libre collaborative resource mapper powered by open-knowledge, starting with books!
    2019-08-21
    book collection library self-hosting
    Permalink
  3. JVM threads and resource usage
    2019-08-01
    concurrency/threading jvm linux programming/java system
    Permalink
  4. Blaeu, creating measurements on RIPE Atlas probes
    2019-04-15
    internet internet-service-provider network network/dns network/ip sysadmin
    Permalink
  5. caching - Tomcat 8 throwing - org.apache.catalina.webresources.Cache.getResource Unable to add the resource
    2019-04-12
    continuous-integration/jenkins memory memory/cache performance programming/java tomcat
    Permalink
  6. Tuning PHP-FPM for high traffic
    2019-03-29
    network/http network/http-server/nginx performance php-fpm programming/php
    Permalink
  7. amazon web services - How should I handle `deposed` resources in Terraform? - Stack Overflow
    2019-02-19
    cloud-computing/aws configuration-management/terraform
    Permalink
  8. Cross-Origin Resource Sharing (CORS) | MDN
    2019-01-23
    domain network/dns network/http security server
    Permalink
  9. Terraforming - Export existing AWS resources to Terraform style (tf, tfstate)
    2019-01-21
    cloud-computing cloud-computing/aws configuration-management/terraform infrastructure
    Permalink
  10. unCaptcha: A Low-Resource Defeat of reCaptcha's Audio Challenge
    2019-01-03
    audio captcha programming/html/form security/authentication web
    Permalink
  11. vim-sql-workbench: SQL database access for Vim
    2018-11-09
    database editor/vim programming/sql query
    Permalink
  12. Software disenchantment @ tonsky.me
    2018-09-29
    code development maintenance performance resource web
    Permalink
  13. Kubernetes Best Practices - GCP Blog
    2018-09-28
    cloud-computing/gcp distributed-system/cluster linux/container/docker linux/container/kubernetes resource
    Permalink
  14. The USE Method: Utilization, Saturation and Errors
    2018-08-18
    application observability observability/logging performance plot resource service
    Permalink
  15. BBC Sound Effects Archive Resource • Research & Education Space
    2018-06-17
    audio bbc effect sound
    Permalink
  16. Percussive Arts Society
    2018-05-28
    instrument/drums instrument/percussion music/rhythm pattern
    Permalink
  17. Jenkins X: Easy CI/CD for Kubernetes - James Strachan, CloudBees
    2018-05-08
    continuous-integration continuous-integration/continuous-delivery continuous-integration/jenkins linux/container/docker linux/container/kubernetes
    Permalink
  18. learning-oop-in-php: A collection of resources to learn object-oriented programming and related concepts for PHP developers.
    2018-04-27
    documentation programming/object-oriented-programming programming/php
    Permalink
  19. Centos/RHEL 7 - Fix LVM boot issues after migration from ESXi to VirtualBox
    2018-04-20
    boot bootloader/grub filesystem filesystem/lvm fstab linux linux/centos linux/kernel linux/red-hat
    Permalink

    Here are the steps I used to migrate a CentOS 7 VM from (presumably?) an ESXi server, to a local VirtualBox environment.

    The LVM volumes were not detected at boot, and after the boot timeout, the OS fell back to the Dracut emergency shell.

    • get a CentOS minimal installation CD
    • check the VM's resources and peripherals:
      • ensure there are no floppy drives (!)
      • setup CPU and RAM resources
      • check virtual drives
      • add an SCSI optical drive if needed
    • optional: convert the virtual drive images from VMDK to VDI
    • mount the CentOS installation disc
    • boot on the installation disc:
      • select "Troubleshooting", then "Rescue"
      • let the rescue utility detect filesystems and mountpoints
    • $ chroot to the detected environment
    • backup files:
      • /etc/fstab
      • /boot/grub/grub.cfg
    • under /boot, backup the initrd and initramfs for the current configuration (these will be overwritten)
    • compare the current /etc/fstab with the output of $ lsblk and $ blkid
    • if needed, manually edit /etc/fstab to use the appropriate block device UUIDs, identifiers and mountpoints
    • regenerate GRUB configuration:
      • $ grub2-mkconfig -o /boot/grub2/grub.cfg
    • if needed, reinstall GRUB:
      • $ grub-install /dev/sda
    • rebuild initrd:
      • $ mkinitrd --force /boot/<initrd_image> <kernel_version>
    • rebuild initramfs:
      • $ dracut --force <kernel_version>
    • exit the chroot
    • unmount the installation disc
    • reboot
    • optional but highly recommended: cross your fingers
    • ...
    • profit!
  20. LVM2 Resource Page
    2018-04-20
    filesystem filesystem/lvm linux linux/kernel
    Permalink