A simple lamp. How much intelligence can we add to a simple lamp ? Well that depends …
What we can control?
What we can measure?
On first iteration we will power on and power off.
The results:
To put things one step forward we need to be have all the controls from all the devices across the house in one single place ( a central hub for the house and be able to control it from anywhere )
This document will describe the process to setup / run an private docker registry v2. This come handy when you need to have a private image repository. Why you might need this ? Imagine that you need a fast local registry or if you feel uncomfortable pushing you private work to docker hub.
If you search the docker documentation they recommend to use it as a container. That will work in most of the cases. In our case we wanted to have it running on a standalone server, to store the data on a shared storage and several other reasons (speed is one of the reasons).
What we need is epel repo installed and we need to install docker-distribution
root@tfm-swrm01: yum search docker-distributionLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile * epel: epel.check-update.co.uk======================= N/S matched: docker-distribution =======================docker-distribution.x86_64 : Docker toolset to pack, ship, store, and deliver : content Name and summary matches only, use "search all" for everything. |
at the time of writing this article the version available is 2.4.1:
[root@tfm-swrm01 registry]# yum info docker-distributionLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile * epel: epel.check-update.co.ukInstalled PackagesName : docker-distributionArch : x86_64Version : 2.4.1Release : 2.el7Size : 15 MRepo : installedFrom repo : extrasSummary : Docker toolset to pack, ship, store, and deliver contentURL : https://github.com/docker/distributionLicense : ASL 2.0Description : Docker toolset to pack, ship, store, and deliver content |
Installing it is pretty forward:
yum install -y docker-distribution |
To enable docker registry to run at boot
systemctl enable docker-distribution.service
and to start it:
systemctl start docker-distribution.service
Configuration is done via /etc/docker-distribution/registry/config.yml . We decided to start with a minimal configuration file and add additional setting later. Below is a configuration file that works :
version: 0.1log: fields: service: registrystorage: cache: layerinfo: inmemory filesystem: rootdirectory: /data/docker-registryhttp: addr: :5000 |
Our shared storage is mounted in /data so keeping images in /data/docker-registry makes sense.
Remember that docker registry supports a lot of storage backend drivers (Local file system,Microsoft’s Azure Blob Storage,Google Cloud Storage, Amazon’s Simple Storage Service (S3) , Openstack Swift object storage, Aliyun OSS for object storage) but we will use local filesystem for now.
Docker has comprehensive documentation regarding parameters supported in config.yml, you can find it at Registry Configuration Reference and we recommend to check it in order to understand what are all the options you can configure.
1) Build a container and tag it to use the custom repository
docker build /tmp/grafana -t 192.168.1.1:5000/custom_grafana
2) Push the image to repository:
docker push 192.168.1.1:5000/custom_grafana
First things first: install the centos 7 minimal.
After instalation:
yum update
yum upgrade
yum install perl perl-core ntpl nmap sudo libidn gmp libaio libstdc++ unzip sysstat sqlite net-tools mc bind-utils telnet
yum remove firewalld
yum install iptables-services
yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
yum install http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
yum install https://www.percona.com/redir/downloads/percona-release/redhat/latest/percona-release-0.1-3.noarch.rpm
yum –enablerepo=remi-php56 install php php-gd php-mysql php-mcrypt
yum install Percona-Server-server-57 percona-xtrabackup
For Centos 7 we didn’t find (yet) a decent software repository for GIT 2.7 . Most probably we will make one and try to maintain it. ( will be covered in another article )
yum install collectd collectd-apache
So , you have decided to purchase a Ricoh Aficio SG3100SNw printer. Good. It’s a good choice for small / medium companies. What we like about it is that it comes with wireless interface and that is quite nice . Less cables more fun. I’m not going to get into details on how to unbox it and make the initial setup. I leave that as an exercise for the reader ( it’s not easy but up to a point it’s fun ) . Continue reading Installing Ricoh Aficio SG3100SNw in linux
When you really need to resize a VM disk image ( and free space to be allocated into partitions inside the vm) you might want to read this:
root@proxmox:~# qemu-nbd -c /dev/nbd0 /mnt/pve/gogu/images/108/vm-108-disk-1.qcow2root@proxmox:~# parted /dev/nbd0(parted) pModel: Unknown (unknown)Disk /dev/nbd0: 82.9GBSector size (logical/physical): 512B/512BPartition Table: msdosDisk Flags:Number Start End Size Type File system Flags 1 1049kB 525MB 524MB primary ext4 boot 2 525MB 42.9GB 42.4GB primary lvm(parted) resizepart 2 82.8Groot@proxmox:~# nbd-client -d /dev/nbd0 |
pvdisplaypvresize /dev/vda2lvextend -l +100%FREE /dev/mapper/vg_webtest01-lv_rootresize2fs /dev/mapper/vg_webtest01-lv_root# In case of xfs use:
# xfs_growfs /dev/mapper/centos_template-root
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