Key Changes in RHEL 7

-
Changes of an peratingo system is divided in to  5 sections
  1. System changes
  2. Security changes
  3. Storage changes
  4. Network changes
  5. Application changes
1.System changes
  32 bits no more in use in RHEL 7, need at least 1GB memory per logical CPU and 2GB memory to run

2.Security changes

firewalld - buildin configurations /usr/lib/firewalld and /etc/firewalld
SELinux can change the options
FSS - Forward Secure sealing
      A new mechanism to secure  systemd journal. It is disabled in default. To enable it, run the command journalctl --setup-keys. By running this "sealing key" and "verification key" are generated, the "verification key" is generated once and stored locally or has to be recorded.
Identity management is used

3.Storage changes
   New default file system is xfs. It allows upto 500TB comparing ext4 allows 16TB in REHL 6. It adds additional features such as best performance for most workloads and less CPU intensive. As a drawback, Shrinking memory is not supported.
NFS 4.1 is supported and intead of GRUB, GRUB2 is used which has the ability to boot various file systems(NFS, xfs, ntfs, exts,raid, etc), and manage all the disk deometries. ALso portability with different architectures(BIOS, EFI, Coreboot,etc)
GFS2, ISCSI and IO sheduler are used.

4.Network Changes

Network manager, Provides a utility named nmcli and can mange all the parts in network. Speed is enhanced(support 40GIgabit Ethernet link speed ) and wireless performance(upto 7Gbps)
New bonding driver is installed, which is better than the driver had in REHL 6.

chrony response better ti rapid changes in the clock frequency. Precision Time Prrotocol(PTP) is better than NTP, and used when conjunction is hardware support found in various network interface cards and hardware switches.
Tcp performance optimization is done, such as fast open by reducing the head of the TCP packets.

The comparison of REHL 7 and REHL 6 is on this article

references - https://www.learnitguide.net/search/label/Linux

Comments

Post a Comment

Popular posts from this blog

How to push a file into a docker container

-
Let's  see how to push a file into the container from the host.  We are assuming the test.html file is the file we are going to copy into the docker container.  web-application is container docker cp test.html web-application:/folderpath we can verify  after log in to the container. docker exec -it web-application bash And then check in the folder path and you will see the file there copied Sources : https://www.linkedin.com/events/kubernetes-freetechnicalworksho6807993779836985344/
Read more

Docker - Begginer 1

-
Image
Docker What, Docker? Opensource platform tool  Manages the containers Allow to build applications in a container with the libraries, binaried and dependencies run from anywhere Why Docker? portability light weight OS fast delivery(impact of light weight os) Multiple isolated OS Resource optimization Continous development and testing Architecture Docker Client Docker Host  Docker Hub(Registery) Also Docker images , Docker containers , Dcker Network and storages are contains in the architecture. Docker client is used to communicate with Docker hosts using Docker daemon is installed in Docker host. Clients are used to manage the Docker components and operations such as create, delete, pull, push, bulid, run etc. Docker client can connect to the Docker host remotly using REST API, UNIX sockets or using a network interface. Docker hub(Registery) is used to pull and push Docker images There are two types of docker hubs Docker Hub Online/Docker Hub
Read more

Project(on going) - IPv6 Fragmentation

-
An IP Datagram travels over different networks, each of which may have different MTU (Maximum Transmit Unit ) , which is the largest IP datagram that can be carried by a network. MTU - - maximum size of an unit which can be transmitted in a network and it depends on the network and media and how they be allowed to transmitted. also encapsulation....etc. It happens when the MTU values of hosts and routers are different from each other;         When we have two different type of network/media connected with router which have different MTU in such case router broke down packet to appropriate size regarding network/media type payload exceed the Maximum Transmission Unit in the interface. so the payload has to be chopped and put them into IP fragmented packets. they are:     -reassembled at destination     -each fragment is independent datagram        - could be routed in a different direction        - could be delivered out of order        - can be used to bypass IPS       
Read more