podman

Install

sudo apt-get install -y software-properties-common uidmap
sudo add-apt-repository -y ppa:projectatomic/ppa
sudo apt-get -y install podman

Container

podman run --name nginx -v /tmp/html:/usr/share/nginx/html:ro -d -p 8080:80 docker://nginx
 
podman run \
    -dt \
    -p 8080:8080/tcp \
    -e HTTPD_VAR_RUN=/var/run/httpd \
    -e HTTPD_MAIN_CONF_D_PATH=/etc/httpd/conf.d \
    -e HTTPD_MAIN_CONF_PATH=/etc/httpd/conf \
    -e HTTPD_CONTAINER_SCRIPTS_PATH=/usr/share/container-scripts/httpd/ \
    registry.fedoraproject.org/f27/

Links
https://podman.io/

Floating IPs

https://docs.openstack.org/ocata/user-guide/cli-manage-ip-addresses.html

openstack floating ip list
 
openstack floating ip create public-net
FLOATING_IP=$(openstack floating ip create public -c floating_ip_address -f value --floating-ip-address 10.11.12.13)
 
openstack floating ip show 1.2.3.4
openstack floating ip list --project ${PROJECT_ID} --long
 
openstack floating ip create --floating-ip-address 1.2.3.4 public
 
# request specific floating IP for a project
openstack floating ip create public --floating-ip-address 1.2.3.4 --project foo-project
 
# show used floating IPs
NETWORK_ID=$(openstack subnet list --network public -c Network -f value)
openstack ip availability show -c total_ips -c used_ips ${NETWORK_ID}
 
# add ip to server
openstack floating ip set --port ${PORT_ID} ${FLOATING_IP}

s3cmd

Install s3cmd (s3 CLI client)

sudo apt install -y s3cmd

Configuration file

s3cmd --configure
${HOME}/.s3cfg

CLI

s3cmd mb s3://buk1
s3cmd put /tmp/1m.img s3://buk1
s3cmd ls s3://buk1
s3cmd du
s3cmd rm s3://buk1/1m.img
s3cmd rb s3://buk1
s3cmd rb s3://buk1 --recursive
s3cmd rm s3://lfs/ --recursive --force
 
s3cmd \
  --access_key xxxxxxxxxxx  \
  --secret_key xxxxxxxxxxxxxx \
  --host-bucket '%(bucket)s.s3.example.com' \
  --host s3.example.com \
  --signature-v2 \
  --no-preserve \
  ls s3://lpz-duply

ACL

s3cmd setacl s3://bucket/path/to/file --acl-public
s3cmd info s3://bucket/path/to/file
s3cmd setacl s3://bucket/path/to/file --acl-private

Links
https://lollyrock.com/articles/s3cmd-with-radosgw/
https://linuxconfig.org/getting-started-with-aws-s3cmd-command-by-examples

s3fs

Install

sudo apt install -y s3fs

Create credentials

echo ACCESS_KEY_ID:SECRET_ACCESS_KEY > ~/.passwd-s3fs
chmod 600 ~/.passwd-s3fs

Mount s3 bucket

s3fs backups /media/backup \
  -o url=https://s3.example.com \
  -o passwd_file=~/.passwd-s3fs

Parameter

-o url=https://s3.example.com,allow_other,umask=0000
-o use_cache=/tmp/cache

/etc/fstab

mybucket1.mydomain.org /mnt/mybucket1 fuse.s3fs _netdev,allow_other,passwd_file=/home/ftpuser/.passwd-aws-s3fs,default_acl=public-read,uid=1001,gid=65534   0 0

Links
https://github.com/s3fs-fuse/s3fs-fuse
https://gridscale.io/community/tutorials/s3-fuse-ubuntu/

NVMe firmware update with Intel SSD Firmware Update Tool

Intel SSD Firmware Update Tool
https://downloadcenter.intel.com/download/30509?v=t
https://downloadcenter.intel.com/download/30373?v=t
https://downloadmirror.intel.com/30509/eng/CLI-Intel-MAS-1.8-User-Guide-Public-342245-010US.pdf

wget https://downloadmirror.intel.com/30373/eng/Intel%C2%AE_SSD_FUT_3.0.11.zip
 
intelmas show -output json
intelmas load -f -intelssd 0
intelmas show -output json -intelssd -sensor
 
for NVME_ID in $(intelmas show -output json -intelssd | jq '.[] | select(.ProductFamily | contains("Intel")) .Index'); do
    intelmas show -intelssd ${NVME_ID}
    intelmas load -force -intelssd ${NVME_ID}
done

Intel NVMe firmware update with Intel SSD Data Center Tool (deprected)
Check for latest version: https://downloadcenter.intel.com/search?keyword=SSD+Firmware+Update+Tool

GRML iPXE etboot from HTTP (without NFS)

# downlaod Grml image
wget http://download.grml.org/grml32-small_2013.02.iso -O /tmp/grml32-small_2013.02.iso

# mount image
mount /tmp/grml32-small_2013.02.iso /mnt/ -o loop

# copy Grml files to tftpboot
mkdir /var/lib/tftpboot/live/grml/32-small/
cp /mnt/boot/grml32small/initrd.img /var/lib/tftpboot/live/grml/32-small/
cp /mnt/boot/grml32small/vmlinuz /var/lib/tftpboot/live/grml/32-small/
cp /mnt/live/grml32-small/grml32-small.squashfs /var/lib/tftpboot/live/grml/32-small/

# configure NFS
echo "/var/lib/tftpboot/live/grml/32-small *(ro,no_root_squash,async,no_subtree_check)

sysctl

configure parameter

# determine the maximum size of a shared memory segment
cat /proc/sys/kernel/shmmax
 
# set default shared memory limit for shmmax (16 GB)
echo 17179869184 > /proc/sys/kernel/shmmax
 
# add the following line to /etc/sysctl.conf to make a change permanent
echo "kernel.shmmax=4294967296" >> /etc/sysctl.d/90-shmmax.conf
 
# load parameter
/sbin/sysctl -p /etc/sysctl.d/90-shmmax.conf

reduce swap usage
https://en.wikipedia.org/wiki/Swappiness

OpenStack: Floating IP port forward (in development / experimental)

List floatin IPs

openstack floating ip list
+--------------------------------------+---------------------+------------------+--------------------------------------+--------------------------------------+----------------------------------+
| ID                                   | Floating IP Address | Fixed IP Address | Port                                 | Floating Network                     | Project                          |
+--------------------------------------+---------------------+------------------+--------------------------------------+--------------------------------------+----------------------------------+
| dc049c28-6562-4c37-834b-d3a612d4b580 | 1.2.3.4        | None             | None                                 | 39583230-154f-4b56-a56e-2fd83c9986ce | 1eede1bdc28344f3acf6b48b232e406f |
+--------------------------------------+---------------------+------------------+--------------------------------------+--------------------------------------+----------------------------------+

List VMs