hostberg

Proxmox with LVM-thin and why we should use Trim/Discard

Excerpts from the Proxmox VE Administration Guide]

LVM normally allocates blocks when you create a volume. LVM thin pools instead allocates blocks when they are written. This behaviour is called thin-provisioning, because volumes can be much larger than physically available space.

8.10.2. Trim/Discard It is good practice to run fstrim (discard) regularly on VMs and containers. This releases data blocks that the filesystem isn’t using anymore. It reduces data usage and resource load. Most modern operating systems issue such discard commands to their disks regularly. You only need to ensure that the Virtual Machines enable the disk discard option.

pinkeen

Run a systemd container using cgroupv2 [NOTES]

Post on r/docker

In theory this would allow the nested systemd init to manage its own resources via slices and scopes - kind of like with LXC's nested mode but without the nasty security implication of bind mounting the real cgroupfs into the container.

Running a systemd container is not the only thing that this would enable - together with fuse-overlayfs it might allow one to run containers inside containers more securely.

The problem is that by default the nested group is mounted ro into the container which should not be necessary according to my research. It gets mounted rw as expected when userns-remap is enabled in Docker what is not desirable for me. I am not sure if docker/moby/containerd is at fault here or if it's a limitation of Linux control groups or user namespaces. It would be great if som

superbrothers

#!/usr/bin/env bash

set -e -o pipefail; [[ -n "$DEBUG" ]] && set -x

CERT_DIR="${CERT_DIR:-"/usr/local/share/ca-certificates"}"

function usage() {
  echo "Usage: $(basename "$0") [-n name] certflie ..." >&2
}

brock

# This is just a cheat sheet:

# On production
sudo -u postgres pg_dump database | gzip -9 > database.sql.gz

# On local
scp -C production:~/database.sql.gz
dropdb database && createdb database
gunzip < database.sql.gz | psql database