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Best practices for using HttpClient in c#

Introduction HttpClient is the library to Get, Post, Put,.. and call WebAPIs and it is very important to use it correctly. This Library has some methods to call web apis which all of them are Async. It is really important to use them in async method but if you are using an Async method in a console application that does not have separate UI thread you can use it like the following code : public void MySyncMethod() { using (HttpClient client = new HttpClient()) { client.BaseAddress = new Uri( "https://google.com" ); var response = client.GetAsync( "SomeAddress" ) .ConfigureAwait( false ).GetAwaiter().GetResult(); if ( response .IsSuccessStatusCode) { //Do Something... } } } Using ConfigureAwait(false) is very important for the applications which does not have separate UI thread Creating HttpClient for each request is not a good Idea and  Reuse  Httpclient as much as possible
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Advanced Installation of Openshift Origin 3.7 on CentOS7 with nfs storage

Installing Openshift origin 3.7 with NFS storage

The first and for most is planning your architecture
In this installation I will try to install 1 master and 3 nodes. your master can use as a node so we will install 1 master and 3 node (use master as a node).
do not forget to register an DNS. in this example I will use sample.com

1- Install and run 3 machine with CentOS 7.x
2- set the hostnames of 3 machine

# hostnamectl set-hostname master.sample.com
# hostnamectl set-hostname node1.sample.com
# hostnamectl set-hostname node1.sample.com

3- forward following domains to the machines


*.sample.com        => master



*.app.sample.com => master







node1.sample.com  => node1



node2.sample.com  => node2

4- generate ssh key in master and copy to all servers as you need to ssh to all machine without password by Ansible

# ssh-keygen -t dsa
# cat .ssh/id_dsa.pub
* copy the keys to all machin in .ssh/authorized_keys file 

6- install fallowing packages in all machines

# yum install wget git net-tools bind-utils iptables-services bridge-utils bash-completion kexec-tools sos psacct
# yum update
# yum install atomic

# yum -y install \
    https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
# sed -i -e "s/^enabled=1/enabled=0/" /etc/yum.repos.d/epel.repo
# yum -y --enablerepo=epel install ansible pyOpenSSL

7- Clone the openshift/openshift-ansible repository from GitHub, which provides the required playbooks and configuration files:(On Master)

# cd ~
# git clone https://github.com/openshift/openshift-ansible
# cd openshift-ansible
 git checkout origin/release-3.7
git pull
8- run the following steps

 
# atomic host upgrade
# yum install docker-1.12.6
# rpm -V docker-1.12.6
9-edit docker-storage and set DOCKER_STORAGE_OPTIONS= -s overlay2

# vi /etc/sysconfig/docker-storage

10- restart the docker like this:

# systemctl stop docker
# rm -rf /var/lib/docker/
# systemctl enable docker
# systemctl start docker

11- install ntp for time

# yum install ntp
# systemctl restart ntpd


12- finally you need to install java in master node

# yum install java-1.8.0-openjdk-headless

13- Add a folder for nfs to the master

# mkdir /exports
# yum install nfs*
14- open a hosts file for ansible configuration

# vi /etc/ansible/origin_hosts


and put the following lines in this file:

 
[OSEv3:children]
masters
nodes
etcd
nfs

[OSEv3:vars]
ansible_ssh_user=root
openshift_deployment_type=origin
openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}]
containerized=true
openshift_docker_use_system_container=True
openshift_release=v3.7.0
openshift_image_tag=v3.7.0
openshift_install_examples=true
enable_docker_excluder=false
enable_openshift_excluder=false

#osm_etcd_image=registry.fedoraproject.org/f26/etcd

osm_use_cockpit=true
osm_cockpit_plugins=['cockpit-kubernetes']
openshift_master_cluster_method=native
osm_custom_cors_origins=['.*']
#osm_default_node_selector='purpose=work'

openshift_disable_check=disk_availability,docker_storage,memory_availability,docker_image_availability
openshift_master_cluster_hostname=occonsole.sample.com
openshift_master_cluster_public_hostname=occonsole.sample.com
openshift_master_default_subdomain=apps.sample.com
openshift_docker_options='--selinux-enabled --insecure-registry 172.30.0.0/16'
openshift_clock_enabled=true
openshift_master_api_port=443
openshift_master_console_port=443

openshift_hosted_router_replicas=1

openshift_enable_service_catalog=false

#######
openshift_hosted_manage_registry=true
openshift_hosted_registry_storage_kind=nfs
openshift_hosted_registry_storage_access_modes=['ReadWriteMany']
openshift_hosted_registry_storage_nfs_directory=/exports
openshift_hosted_registry_storage_nfs_options='*(rw,root_squash)'
openshift_hosted_registry_storage_volume_name=registry
openshift_hosted_registry_storage_volume_size=10Gi
openshift_hosted_registry_replicas=1
openshift_hosted_registry_deploy=true

openshift_logging_install_logging=true
openshift_hosted_logging_enable_ops_cluster=True
openshift_logging_use_ops=true
openshift_logging_kibana_hostname=kibana.apps.sample.com
openshift_logging_storage_kind=nfs
openshift_logging_storage_access_modes=['ReadWriteOnce']
openshift_logging_storage_nfs_directory=/exports
openshift_logging_storage_nfs_options='*(rw,root_squash)'
openshift_logging_storage_volume_name=logging
openshift_logging_storage_volume_size=10Gi
openshift_logging_storage_labels={'storage': 'logging'}
openshift_hosted_logging_deploy=true


openshift_metrics_install_metrics=true
openshift_metrics_storage_kind=nfs
openshift_metrics_storage_access_modes=['ReadWriteOnce']
openshift_metrics_storage_nfs_directory=/exports
openshift_metrics_storage_nfs_options='*(rw,root_squash)'
openshift_metrics_storage_volume_name=metrics
openshift_metrics_storage_volume_size=10Gi
openshift_metrics_storage_labels={'storage': 'metrics'}
openshift_metrics_hawkular_hostname=hawkular-metrics.apps.sample.com
openshift_metrics_cassandra_storage_type=nfs
openshift_hosted_metrics_deploy=true

openshift_hosted_prometheus_deploy=false
openshift_prometheus_storage_kind=nfs
openshift_prometheus_storage_access_modes=['ReadWriteOnce']
openshift_prometheus_storage_nfs_directory=/exports
openshift_prometheus_storage_nfs_options='*(rw,root_squash)'
openshift_prometheus_storage_volume_name=prometheus
openshift_prometheus_storage_volume_size=10Gi
openshift_prometheus_storage_labels={'storage': 'prometheus'}

openshift_prometheus_storage_type='pvc'
openshift_prometheus_alertmanager_storage_kind=nfs
openshift_prometheus_alertmanager_storage_access_modes=['ReadWriteOnce']
openshift_prometheus_alertmanager_storage_nfs_directory=/exports
openshift_prometheus_alertmanager_storage_nfs_options='*(rw,root_squash)'
openshift_prometheus_alertmanager_storage_volume_name=prometheus-alertmanager
openshift_prometheus_alertmanager_storage_volume_size=10Gi
openshift_prometheus_alertmanager_storage_labels={'storage': 'prometheus-alertmanager'}
openshift_prometheus_alertmanager_storage_type='pvc'

openshift_prometheus_alertbuffer_storage_kind=nfs
openshift_prometheus_alertbuffer_storage_access_modes=['ReadWriteOnce']
openshift_prometheus_alertbuffer_storage_nfs_directory=/exports
openshift_prometheus_alertbuffer_storage_nfs_options='*(rw,root_squash)'
openshift_prometheus_alertbuffer_storage_volume_name=prometheus-alertbuffer
openshift_prometheus_alertbuffer_storage_volume_size=10Gi
openshift_prometheus_alertbuffer_storage_labels={'storage': 'prometheus-alertbuffer'}
openshift_prometheus_alertbuffer_storage_type='pvc'

#######

openshift_master_overwrite_named_certificates=true
openshift_set_hostname=True

#openshift_node_kubelet_args={'pods-per-core': ['10'], 'max-pods': ['250'], 'image-gc-high-threshold': ['90'], 'image-gc-low-threshold': ['80']}

[masters]
master.sample.com openshift_schedulable=false

[etcd]
master.sample.com openshift_schedulable=false

[nfs]
master.sample.com openshift_schedulable=false

[nodes]
master.sample.com openshift_schedulable=false
node1.sample.com  openshift_node_labels="{'region': 'infra', 'zone': 'default'}" openshift_schedulable=true
node2.sample.com  openshift_node_labels="{'region': 'infra', 'zone': 'default'}" openshift_schedulable=true

And Now you have to run install file by ansible:

# ansible-playbook -i /etc/ansible/origin_hosts openshift-ansible/playbooks/byo/config.yml -vvv

after about 20 minutes you will have your openshift :)


you can create user whith htpasswd

# htpasswd -b /etc/origin/master/htpasswd [user] [pass]

add access to all projects to your user

oc adm policy add-cluster-role-to-user cluster-admin user


now you can open your open shift in browser:

https://occonsole.sample.com



Comments

  1. UnknownJanuary 15, 2018 at 8:21 AM

    openshift-master-api not worked

    ReplyDelete
  2. UnknownJanuary 15, 2018 at 8:21 AM

    Can you help me

    ReplyDelete
    Replies
    1. Farshid MirzaJanuary 17, 2018 at 4:09 AM

      What can I do for you? would you please give some details?

      Delete
  3. UnknownJanuary 23, 2018 at 1:25 PM

    Did you try install OCP with openshift_node_kubelet_args activated ? It doesn't work with me, I get python errors.

    ReplyDelete
    Replies
    1. UnknownJanuary 23, 2018 at 1:27 PM

      my name is Akram BLOUZA. I just discovred your blog, I did the same thing in
      http://blog.wescale.fr/2018/01/21/simuler-une-installation-dun-cluster-openshift-prod-ready-en-30-minutes/

      Delete
    2. Farshid MirzaFebruary 4, 2018 at 1:03 AM

      You can use following line in advance installation

      openshift_node_kubelet_args={'max-pods': ['40'], 'resolv-conf': ['/etc/resolv.conf'], 'image-gc-high-threshold': ['90'], 'image-gc-low-threshold': ['80']}

      or you can change it after installation.

      Delete

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