GLUSTERFS TUTORIAL PDF

Hence the first thing that we need to do is to start the glusterd service, which can be done as shown below. Please remember the fact that we need to start glusterd service on all node servers. For showing this example tutorial of glusterfs i will be using MB partitions on each server. So we will be having a volume with MB to mount on the client server However this depends on the type of gluster you are using, we will discuss that shortly. This storage pool will simply authorize your required servers, as part of that storage pool.

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Hence the first thing that we need to do is to start the glusterd service, which can be done as shown below. Please remember the fact that we need to start glusterd service on all node servers. For showing this example tutorial of glusterfs i will be using MB partitions on each server. So we will be having a volume with MB to mount on the client server However this depends on the type of gluster you are using, we will discuss that shortly. This storage pool will simply authorize your required servers, as part of that storage pool.

Please remember the fact that you need to have perfect DNS setup, if you are going to use host names while adding servers to the pool. Otherwise you might get an error something like the below. You might be thinking, that i have not added the server1 through the same probe command. Even if you try to add it you will get a message like the below one. The below command can be used to create the gluster volume with 1 brick from each node server. Please start the volume to access data. This command shown below will give you the complete information about the volume.

This field needs a little more explanation as there is a large difference between different types of volumes in gluster. We will be discussing one by one differently in this article.

The default one is "distributed" Transport: This tells the type of transport mechanism used to establish communication between the server nodes taking part in the volume. There are different types of transport methods that can be used. One is TCP, the other is high speed Infiniband cable connection between the server nodes which requires the specific infiniband drivers to be installed on both the servers.

If you do not specify the transport method during volume creation the default one is selected, which is TCP in our case.

Different types of volumes in gluster file system As we have seen in the previous volume info command, there is something called as type of the volume.

The selection depends upon the requirement. Some of them are good for scaling storage size, while some of them are good for performance, and you can also use combination of two types together to get both the advantages. In other words, file 1 might be stored in the first brick, and file 2 might be stored in the other brick. There is no redundancy provided by gluster if you have created a distributed volume. The main purpose behind making a distributed storage volume with gluster is to easily scale the volume size.

If you did not specify any option while creating the volume, the default option is to create a distribute type of volume. Please keep the fact in mind that distributed volume does not provide any data redundancy, which means a brick failure will cause a complete data loss. You need to rely on the underlying hardware for data loss protection in distributed volume.

Our previously created volume without any option is a distributed volume. Summery of distributed Volume are mentioned below. Files are randomly distributed over the bricks in distributed volume There is no redundancy Data loss protection is provided by the underlying hardware no protection from gluster Best for scaling size of the volume Replicated Volumes in gluster file system Replicated volumes are made for better reliability and data redundancy.

So even if one brick is failed, then also the data is protected and safe, and is also accessible. Exact copy of data is maintained on all the bricks in replicated volume.

But yeah the number of replica that you want to create with the replicated volume option is your choice. In simple words, you need to have two bricks for creating a replicated volume with 2 replicas. The command is shown below. Summery of Replicated volume: Useful where availability is the priority Useful where redundancy is the priority Number of bricks should be equal to number of replicas.

If you want 5 replica then you need to have 5 bricks Striped Volumes in Gluster File system Striped volume stores data in the bricks after dividing into different stripes. Due to large number of clients accessing the same file in the same brick the performance will be reduced. For this a good solution is to stripe the file into smaller chunks and store it in differnt bricks due to which the load will be distrubuted among bricks and file can be fetched faster.

This is what happens in striped volume. The stripe count you give as an argument while creating striped volume must be equal to the number of bricks in the volume. Creating a striped volume is very much similar to creating replicated volume. Striped volume can be created by the below command. Summery of striped volume in gluster file system Striped volume does not provide redundancy disaster in one brick can cause data loss number of stripe must be equal to number of bricks provides added performance if large number of clients are accessing the same volume Distributed Striped Volumes in Gluster File System Distributed striped volumes are very much similar to striped volume, with an added advantage that you can distribute the stripes across more number of bricks on more nodes.

In other words, you can distribute data with 4 stripes onto 8 servers. So in simple words if you want to create a distributed striped volume then you will have to create a striped volume with 2 stripes and with 4 bricks. Basically if your number of bricks in the volume is double the number of stripes then your volume type is distributed striped. Basically you can distribute the stripes across several bricks. Even if you want to increase the number of bricks later to increase the volume size, you need to add more bricks in the multiple of stripe number.

The below command can be used to create a distributed striped volume. If you see the above command, we have used a stripe count of 2 and total number of bricks used is 4 which is a multiple of stripe number 2. If you create a volume with two bricks and a stripe count of 2, it will make a striped volume and not a distributed striped volume. Summery of Distributed Striped Volume It stripes files across multiple bricks Good for performance in accessing very large files Brick count must always be in multiple of stripe count Distributed Replicated Volumes in Gluster Distributed replicated volumes are used to store files in replicated bricks.

It is very much similar to distributed striped volume. In distributed replicated volumes bricks must be a multiple of replica count. Files are distributed over replicated sets of bricks. It is used for an environment where high availability due to redundancy and scaling storage is very much critical. An extra care must be taken while adding bricks while creating distributed replicated volumes.

In fact i must say the order in which you specify bricks matters a lot. This setup is not optimal. Do you still want to continue creating the volume? The order of the bricks given in the command is as shown below. So if you have a replica count of 3 and you have 9 disks then the first 3 bricks, in the same order given by you becomes the first replica, the second three bricks becomes the second replica and so on. Summery of Distributed Replicated Volume Data is distributed across replicated sets Good redundancy and good scaling We have seen 5 different types of volume that can be made with different number of bricks.

However we have not seen how to start those volume so that clients can mount it and use that volume. How to start a volume in glusterfs A glusterfs volume can be started by the below command. You can start your volume by this command for any type of volume you have created. How to access a glusterfs volume The primary method recommended for accessing glusterfs volume is through glusterfs client. Glusterfs client must be installed on the clients who require access to the volume.

However this is the best method of all for accessing gluster volumes for the following reasons. Another method that can be used to access glusterfs volume is through NFS. Also gluster volume can be accessed by CIFS in windows. For this to work properly, you need to have the below packages on the client.

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Installing GlusterFS - a Quick Start Guide Purpose of this document This document is intended to provide a step-by-step guide to setting up GlusterFS for the first time with minimum degree of complexity. If you would like a more detailed walkthrough with instructions for installing using different methods in local virtual machines, EC2 and baremetal and different distributions, then have a look at the Install guide. Using Ansible to deploy and manage GlusterFS If you are already an Ansible user, and are more comfortable with setting up distributed systems with Ansible, we recommend you to skip all these and move over to gluster-ansible repository, which gives most of the details to get the systems running faster. Step 1 — Have at least three nodes Fedora 30 or later on 3 nodes named "server1", "server2" and "server3" A working network connection At least two virtual disks, one for the OS installation, and one to be used to serve GlusterFS storage sdb , on each of these VMs. This will emulate a real-world deployment, where you would want to separate GlusterFS storage from the OS install. Setup NTP on each of these servers to get the proper functioning of many applications on top of filesystem. If at any point in time GlusterFS is unable to write to these files for example, when the backing filesystem is full , it will at minimum cause erratic behavior for your system; or worse, take your system offline completely.

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