Book Image

Mastering Service Mesh

By : Anjali Khatri, Vikram Khatri
Book Image

Mastering Service Mesh

By: Anjali Khatri, Vikram Khatri

Overview of this book

Although microservices-based applications support DevOps and continuous delivery, they can also add to the complexity of testing and observability. The implementation of a service mesh architecture, however, allows you to secure, manage, and scale your microservices more efficiently. With the help of practical examples, this book demonstrates how to install, configure, and deploy an efficient service mesh for microservices in a Kubernetes environment. You'll get started with a hands-on introduction to the concepts of cloud-native application management and service mesh architecture, before learning how to build your own Kubernetes environment. While exploring later chapters, you'll get to grips with the three major service mesh providers: Istio, Linkerd, and Consul. You'll be able to identify their specific functionalities, from traffic management, security, and certificate authority through to sidecar injections and observability. By the end of this book, you will have developed the skills you need to effectively manage modern microservices-based applications.
Table of Contents (31 chapters)
1
Section 1: Cloud-Native Application Management
4
Section 2: Architecture
8
Section 3: Building a Kubernetes Environment
10
Section 4: Learning about Istio through Examples
18
Section 5: Learning about Linkerd through Examples
24
Section 6: Learning about Consul through Examples

Installing a load balancer

Managed Kubernetes services such as Google or IBM Cloud will provide an external load balancer. Since our Kubernetes environment is standalone, we do not have an external load balancer; we install and use keepalived as a load balancer.

The keepalived load balancer depends on the ip_vs kernel module to be loaded. Follow these steps:

  1. Make sure that the ip_vs kernel module is loaded:
$ sudo lsmod | grep ^ip_vs
ip_vs_wlc 12519 0
ip_vs 145497 2 ip_vs_wlc
  1. If the preceding does not show any output, load the module:
$ sudo ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
  1. Run sudo lsmod | grep ^ip_vs to make sure that the module is loaded.
  2. Add ip_vs to the module list so that it is loaded automatically on reboot:
$ echo "ip_vs" | sudo...