Redis on Openshift at IBM cloud

Installation, configuration and data manipulation testing

Redis Operator on Openshift

Redis Enterprise Software is enterprise grade, distributed, in-memory NoSQL database server, fully compatible with open source Redis by Redis Labs. Redis Enterprise Software extends open source Redis and delivers stable high performance, zero-downtime linear scaling and high availability, with significant operational savings. Redis Enterprise provides a flexible and cost-effective data platform so developers can focus on rapid, high-quality development for sophisticated use cases that meet the needs of a modern digital enterprise. With Redis Enterprise, you can:

• Enjoy high performance and record-setting low latencies with minimal operational overhead
• Develop highly scalable microservices-based and Kubernetes-orchestrated applications
• Use versatile data structures for a variety of use cases, such as high-speed transactions, user session management, real-time analytics, caching and many more
• Leverage enterprise-grade operational controls for high availability, security and seamless scale
• Automate operational best practices for deploying and managing the Redis Enterprise data platform with built-in Kubernetes Operator support
• Deploy, manage and move applications to and from any cloud for seamless portability

Installation Redis operator

When you search “redis” at operatorHub, there are 2 redis. I selected “Redis Enterprise Operator”, which is validated by Red hat.

Prerequisite

1. A minimum of 3 nodes which support the following requirements:

• RAM — At least 3GB with 4GB recommended
• Persistent Storage — At least 10GB of free space with 20GB recommended.
• A kubernetes version of 1.9 or higher

2. Create “SecurityContextConstraints”

https://raw.githubusercontent.com/RedisLabs/redis-enterprise-k8s-docs/master/openshift/scc.yaml

kind: SecurityContextConstraints
apiVersion: security.openshift.io/v1
metadata:
  name: redis-enterprise-scc
allowPrivilegedContainer: false
allowedCapabilities:
  - SYS_RESOURCE
runAsUser:
  type: MustRunAs
  uid: 1001
FSGroup:
  type: MustRunAs
  ranges: 1001,1001
seLinuxContext:
  type: RunAsAny

3. Grant permission

oc adm policy add-scc-to-group redis-enterprise-scc system:serviceaccounts:<my-project>

Install & create instance

With default, you can install and create instance continuously as below. But user name, you can change this with yours.

When the installation is completed, there are 5 pods including 3 redis nodes. Each nodes are distributed in Openshift worker nodes automatically.

Setup Redis UI & Create database

1. Check services

[root@parkhsu scripts]# oc get svc
NAME                TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)                      AGE
rec                 ClusterIP      None            <none>         9443/TCP,8001/TCP,8070/TCP   17h
rec-ui              ClusterIP      172.21.208.91   <none>         8443/TCP                     17h

2. Create route

Secure route option is required, TLS termination-passthrough and Insecure Traffic-Redirect.

3. login Redis UI

Route shows URL for external connection like “https://redis-ui-redis.mycluster-seo01-b-846966-459b20226bb1c287a0d9b56673f326f3-0000.seo01.containers.appdomain.cloud/#/login” .

You can find userid and password at “Secret rec” , rec is Redis cluster name.

4. create database

Access the database “sampledb”

1. Check services : when you created sampledb, service will be created automatically. But I am not sure how to use this service, although I have try to do many times.

[root@parkhsu ~]# oc get svc
NAME                TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)                      AGE
rec                 ClusterIP      None            <none>         9443/TCP,8001/TCP,8070/TCP   19h
rec-ui              ClusterIP      172.21.208.91   <none>         8443/TCP                     19h
sampledb            ClusterIP      172.21.169.64   <none>         15704/TCP                    19h

2. And then I create new service with load balancer type . YAML sample is as below.

apiVersion: v1
kind: Service
metadata:
  name: sampledb
spec:
  ports:
  - name: redis
  port: 15704
  targetPort: 15704
  type: LoadBalancer
  selector:
    redis.io/bdb-1: '1'

Load Balancer type Service is created.

[root@parkhsu scripts]# oc get svc
NAME                TYPE           CLUSTER-IP      EXTERNAL-IP    PORT(S)                      AGE
rec                 ClusterIP      None            <none>         9443/TCP,8001/TCP,8070/TCP   16h
rec-ui              ClusterIP      172.21.208.91   <none>         8443/TCP                     16h
sampledb            ClusterIP      172.21.169.64   <none>         15704/TCP                    16h
sampledb-headless   ClusterIP      None            <none>         15704/TCP                    16h
sampledb-lb         LoadBalancer   172.21.71.250   169.56.67.74   15704:30571/TCP              7m25s

3. Installing redis-cli on your remote server. It’s not required to install the redis server, but I want to use “redis-cli” on my remote server, which is ubuntu. The easiest way is to use “apt install redis”

How To Install and Secure Redis on Ubuntu 18.04 | DigitalOcean

4. logon to redis server

Host IP aress and Port number is defined at route above.

root@parkhsu2:~# redis-cli -h 169.56.67.74 -p 30571 -a password
169.56.67.74:30571> set a 'hello'
OK
169.56.67.74:30571> get a
"hello"

5. Sample cli commands are here for redis-cli. You can test for data manipulation.

info
set 1 "one"
set 2 "two"
set 3 "three"
set 4 "four"
set five "five"
get 1
get 4
rename five 5
get 5
set 11 "eleven"
keys 1*
randomKey
save

Redis Desktop Manager to access sampledb

Redis Desktop Manager offers you an easy-to-use GUI to access your Redis databases and perform some basic operations:

• View keys as a tree
• CRUD keys
• Analyze memory usage for entire DB or for selected namespace in tree-view (redis-server >= 4.0 is required)
• List connected clients, Pub/Sub channels and Slow log commands
• Execute commands via shell

I installed it with trial version, which is required license with sign up.

Install - Redis Desktop Manager

1. Configuration for sampledb

When you install “Redis Desktop Manager” on your windows desk top, you need to configure it with parameters, which are same with “redis-cli”.

Then you can check the data in sampledb and you can manipulate it directly in your desktop.