using s3 as backend storage for docker registry

setenforce 0
systemctl stop firewalld

docker run -d -p 5000:5000 --restart=always --name registry -v /root/config.yml:/etc/docker/registry/config.yml -v /etc/hosts:/etc/hosts registry:2

docker exec -it 0ba1bdfc1491 cat /etc/docker/registry/config.yml

docker pull ubuntu:16.04

docker tag ubuntu:16.04 localhost:5000/my-ubuntu

docker push localhost:5000/my-ubuntu

docker image remove ubuntu:16.04

docker image remove localhost:5000/my-ubuntu

docker pull localhost:5000/my-ubuntu

docker container stop registry && docker container rm -v registry

config.yml

version: 0.1

log:

  fields:

    service: registry

storage:

  cache:

    blobdescriptor: inmemory

  s3:

    accesskey: GWHHQI5NSYBV1A756W32

    secretkey: TzDlHsn66miM9TddT85DoLqUuBBmJSzxbtTxW6sO

    region: default

    regionendpoint: http://docker.qct.io

    bucket: registry

    secure: false

    v4auth: true

http:

  addr: :5000

  headers:

    X-Content-Type-Options: [nosniff]

health:

  storagedriver:

    enabled: true

    interval: 30s

    threshold: 1

software raid on RHEL7.5

review disk layout
parted /dev/sdx u s p

raid creation process
1: create 2x type code 0xfd partitions

2: set raid flag to all partitions
parted /dev/sdx set 1 raid on

3: set boot flag to partition which serves for grub configuration files
parted /dev/sdx set 1 boot on

4: zero out superblock

mdadm --zero-superblock /dev/sdx[1-9]

5: create raid

mdadm --create /dev/md0 --name=root -n2 -l1 /dev/sda1 /dev/sdb1

mdadm --create /dev/md0 --name=root -n2 -l1 /dev/sda2 /dev/sdb2

6: delete raid

mdadm --delete /dev/md0

mdadm --zero-superblock /dev/sdx[1-9]

mdadm --stop /dev/md0

6: repair raid

mdadm --add /dev/md0 /dev/sda1

7:scan available md

mdadm --examine --scan

mdadm --examine /dev/sdx[1-9]

8: raid uuid - this information need to be included in /etc/default/grub
mdadm --detail /dev/md0|grep UUID
rd.md.uuid=xxxx

9: activate software raid
mdadm -A -R /dev/md0 /dev/sda1 /dev/sdb1

others:
don't forget to creating new initramfs
dracut -f --mdadmconf

to install grub2 on a drive. mdadm package needs to be installed first and grub needs to be installed to whole disk drive instead of partition. grub needs to be installed on both drives
grub2-install --no-floppy --boot-directory=/boot /dev/sda