The advantages of this strategy are as follows: Add the following storage policy configuration to the configuration file and restart the clickhouse service. [Required] From the drop-down list, select the number of storage tiers. When the HDFS database becomes full, events have to be deleted to make room for new events. To switch your ClickHouse database to Elasticsearch, take the following steps.
Set up EventDB as the online database, by taking the following steps. Each Org in its own Index - Select to create an index for each organization. You can bring back the old data if needed (See Step 7). If two tiers are configured (Hot and Warm) without an archive, when the Warm tier has less than 10% disk space left, the oldest data is purged from the Warm disk space until 20% free space is available. If Cold nodes are defined and the Cold node cluster storage capacity falls below lower threshold, then: if Archive is defined, then they are archived, Select and delete the existing Workers from. You can have 2 Tiers of disks with multiple disks in each Tier. In the initial state, the data storage directory specified in the clickhouse configuration file is: Start the client and view the disk directory perceived by the current clickhouse: Create a corresponding directory for storing clickhouse data in each disk, and modify the directory owner to click house user, Modify the service configuration file / server / clickhouse.etc/clickhouse XML add the above disks, At this point, check the disk directory perceived by clickhouse. So that clickhouse can realize stepped multi-layer storage, that is, the cold and hot data are separated and stored in different types of storage devices. Through the above operations, multiple disks are configured for clickhouse, but only these can not make the data in the table exist in the configured multiple disks. Configure the rest of the fields depending on the ESService Type you selected. Space-based retention is based on two thresholds defined in phoenix_config.txt file on the Supervisor node. Navigate to ADMIN>Setup >Storage >Online. With this procedure, we managed to migrate all of our Clickhouse clusters (almost) frictionless and without noticeable downtime to a new multi-disk setup. Now on Cloud: altinity.com/cloud-database, Portability of applications across Kubernetes distributions, part 2, Observing threshold based query prioritization in Apache Druid, Dynamic Fan-out and Fan-in in Argo Workflows, Creating network "docker-compose_default" with the default driver, Name Command State Ports, docker-compose exec clickhouse1 bash -c 'clickhouse-client -q "SELECT version()"', SELECT disk_name FROM system.parts WHERE table='minio', s3(path, [aws_access_key_id, aws_secret_access_key,] format, structure, [compression]), INSERT INTO FUNCTION s3('http://minio:9001/root/data2', 'minio', 'minio123', 'CSVWithNames', 'd UInt64') SELECT *, ClickHouse and S3 Compatible Object Storage, https://gitlab.com/altinity-public/blogs/minio-integration-with-clickhouse.git. Edit phoenix_config.txt on the Supervisor and set enable = false for ClickHouse. Click the checkbox to enable/disable. If multiple tiers are used, the disks will be denoted by a number: Setup Elasticsearch as online database by taking the following steps. Here we use cluster created with kops.
If you are running a FortiSIEM Cluster using NFS and want to change the IP address of the NFS Server, then take the following steps. A Pod refers "volumes: name" via "volumeMounts: name" in Pod or Pod Template as: This "volume" definition can either be the final object description of different types, such as: After version 19.15, data can be saved in different storage devices, and data can be automatically moved between different devices. Enter the following parameters : First, Policy-based retention policies are applied. 1 tier is for Hot. Verify events are coming in by running Adhoc query in ANALYTICS. Next, you will need to check if you can bring up the docker-compose cluster. The following storage change cases need special considerations: Assuming you are running FortiSIEM EventDB on a single node deployment (e.g. This check is done hourly. Let's create encrypted volume based on the same gp2 volume. For information on how to create policies, see Creating Offline (Archive) Retention Policy. MinIO can also be accessed directly using ClickHouses S3 table function with the following syntax. This is set by Archive Thresholds defined in the GUI. Copy the data, using the following command. If you want to add or modify configuration files, these files can be changed in the local config.d directory and added or deleted by changing the volumes mounted in the clickhouse-service.yml file. 
Stop all the processes on the Supervisor by running the following command. Otherwise, they are purged. Then also remove the old disk from the default storage policy: Now, after restarting Clickhouse, your old disk will not be in use anymore and you can safely remove it. For example, after running a performance benchmark loading a dataset containing almost 200 million rows (142 GB), the MinIO bucket showed a performance improvement of nearly 40% over the AWS bucket! You can also configure multiple disks and policies in their respective sections. Eventually, when there are new bigger parts left to move, you can adjust the storage policy to have a move_factor of 1.0 and a max_data_part_size_bytes in the kilobyte range to make Clickhouse move the remaining data after a restart. Note that this time you must omit the / from the end of your endpoint path for proper syntax. Policies can be used to enforce which types of event data remains in the Online event database. You signed in with another tab or window. Again, note that you must execute all docker-compose commands from the docker-compose directory. # rm -f /etc/clickhouse-server/config.d/*. To achieve this, we we enhance the default storage policy that clickhouse created as follows: We leave the default volume which points to our old data mount in there but add a second volume called data which consists of our newly added disks. They appear under the phDataPurger section: - archive_low_space_action_threshold_GB (default 10GB), - archive_low_space_warning_threshold_GB (default 20GB). Although storage in a local Docker container will always be faster than cloud storage, MinIO also outperforms AWS S3 as a cloud storage bucket. Navigate to ADMIN> Setup >Storage > Online. However, it is possible to switch to a different storage type. Control hybrid modern applications with Instanas AI-powered discovery of deep contextual dependencies inside hybrid applications. Again, with the query above, make sure all parts have been moved away from the old disk. The following sections describe how to set up the Online database on Elasticsearch: There are three options for setting up the database: Use this option when you want FortiSIEM to use the REST API Client to communicate with Elasticsearch. Edit phoenix_config.txt on Supervisor and set enable = false for ClickHouse. Note: This command will also stop all events from coming into the Supervisor.
In the IP/Host field, select IP or Host and enter the remote NFS server IPAddress or Host name. 2 tiers include Hot and Warm tiers. Log into FortiSIEM Supervisor GUIas a full admin user. Notice that we can still take advantage of the S3 table function without using the storage policy we created earlier. It is strongly recommended you confirm that the test works, in step 4 before saving. Remove the data by running the following command. MinIO is an extremely high-performance, Kubernetes-native object storage service that you can now access through the S3 table function. # lvremove /dev/mapper/FSIEM2000G-phx_eventdbcache: y. As a bonus, the migration happens local to the node and we could keep the impact on other cluster members close to zero. You can observe through experiments: JBOD ("Just a Bunch of Disks"), by allocating multiple disks to a volume, the data part s generated by each data insertion will be written to these disks in turn in the form of polling. You can see that a storage policy with multiple disks has been added at this time, Added by DuFF on Wed, 09 Mar 2022 03:46:19 +0200, Formulate storage policies in the configuration file and organize multiple disks through volume labels, When creating a table, use SETTINGS storage_policy = '' to specify the storage policy for the table, The storage capacity can be directly expanded by adding disks, When multithreading accesses multiple different disks in parallel, it can improve the reading and writing speed, Since there are fewer data parts on each disk, the loading speed of the table can be accelerated. Online Event Database on Local Disk or on NFS, Setting Elasticsearch Retention Threshold, [Required] the IP address/Host name of the NFS server, [Required] the file path on the NFS Server which will be mounted, [Optional] Password associated with the user. Altinity is the leading enterprise provider for ClickHouse a fast open-source column-store analytic database. Example on how this persistentVolumeClaim named my-pvc can be used in Pod spec: StatefulSet shortcuts the way, jumping from volumeMounts directly to volumeClaimTemplates, skipping volume. With this information in place, how can we now manage to move our existing data of the under-utilized disks onto a new setup? With this configuration in place, after a restart Clickhouse will start doing the work and you will see log messages like this: During the movement, progress can be checked by looking into the system.parts table to see how many parts are still residing on the old disk: The number of active parts will start to go down as clickhouse starts to move away parts, starting with small parts first and working its way to the bigger parts. If multiple tiers are used, the disks will be denoted by a number. More information on phClickHouseImport can be found here. Even though this is a small example, you may notice above that the query performance for minio is slower than minio2. In his article ClickHouse and S3 Compatible Object Storage, he provided steps to use AWS S3 with ClickHouses disk storage system and the S3 table function. The NFS Storage should be configured as NFS version 3 with these options: rw,sync,no_root_squash. Similarly, when the Archive storage is nearly full, events are purged to make room for new events from Online storage. So Clickhouse will start to move data away from old disk until it has 97% of free space. First, we will check that we can use the minio-client service. Now you are ready to insert data into the table just like any other table. From the Event Database drop-down list, select EventDB Local Disk. You can specify the storage policy in the CREATE TABLE statement to start storing data on the S3-backed disk. 2000F, 2000G, 3500G and VMs), the following steps shows how to migrate your event data to ClickHouse. Edit and remove any mount entries in /etc/fstab that relates to ClickHouse. When the Online event database becomes full, FortiSIEM will move the events to the Archive Event database. For hardware appliances 2000F, 2000G, or 3500G, proceed to Step 10. Configure storage for EventDB by taking the following steps. This provides actionable feedback needed for clients as they to optimize application performance, enable innovation and mitigate risk, helping Dev+Ops add value and efficiency to software delivery pipelines while meeting their service and business level objectives. For a complete guide to S3-compatible storage configuration, you may refer back to our earlier article: ClickHouse and S3 Compatible Object Storage. Disks can be grouped into volumes and again there has been a default volume introduced that contains only the default disk. Unmount data by taking the following step depending on whether you are using a VM (hot and/or warm disk path) or hardware (2000F, 2000G, 3500G). But the documentation states that, Once a table is created, its storage policy cannot be changed.. else if Warm nodes are not defined, but Cold nodes are defined, the events are moved to Cold nodes. We will use a docker-compose cluster of ClickHouse instances, a Docker container running Apache Zookeeper to manage our ClickHouse instances, and a Docker container running MinIO for this example.
In our case we only had a TinyLog table that holds our migration state which luckily doesnt get any live data: Adjust your server.xml to remove the old disk and make one of your new disks the default disk (holding metadata, tmp, etc.). When present, the user can create a PersistentVolumeClaim having no storageClassName specified, simplifying the process and reducing required knowledge of the underlying storage provider. # mount -t nfs
Through stepped multi-layer storage, we can put the latest hot data on high-performance media, such as SSD, and the old historical data on cheap mechanical hard disk. Click + to add more URL fields to configure any additional Elasticsearch cluster Coordinating nodes. Upon arrival in FortiSIEM, events are stored in the Online event database. Remove old ClickHouse configuration by running the following commands. Once you have stored data in the table, you can confirm that the data was stored on the correct disk by checking the system.parts table. In daily interactive queries, 95% of queries access data in recent days, and the remaining 5% run some long-term batch tasks. Event destination can be one of the following: When Warm Node disk free space reaches the Low Threshold value, events are moved to Cold node. This is the machine which stores the HDFS metadata: the directory tree of all files in the file system, and tracks the files across the cluster. When the Hot node cluster storage capacity falls below the lower threshold or meets the time age duration, then: if Warm nodes are defined, the events are moved to Warm nodes. Pay attention to .spec.template.spec.containers.volumeMounts: As we have discussed in AWS-specific section, AWS provides gp2 volumes as default media. Otherwise, they are purged. Creating Offline (Archive) Retention Policy. Now you can connect to one of the ClickHouse nodes or your local ClickHouse instance. Here is an example configuration file using the local MinIO endpoint we created using Docker. Click Deploy Org Assignment to make the change take effect. When the Archive disk space reaches the low threshold (archive_low_space_action_threshold_GB) value, events are purged until the Archive disk space reaches the high threshold (online_low_space_warning_threshold_GB) value. This strategy keeps FortiSIEM running continuously. Once it was back up it picked up where it left. In some cases, we saw the following error, although there was no obvious shortage on neither disk nor memory. In November 2020, Alexander Zaitsev introduced S3-compatible object storage compatibility with ClickHouse. Make sure phMonitor process is running. For best performance, try to write as few retention policies as possible. ), phClickHouseImport --src /test/sample --starttime "2022-01-27 10:10:00" --endtime "2022-02-01 11:10:00", [root@SP-191 mnt]# /opt/phoenix/bin/phClickHouseImport --src /mnt/eventdb/ --starttime "2022-01-27 10:10:00" --endtime "2022-03-9 22:10:00", [ ] 3% 3/32 [283420]. Before we start, lets first dive into the basics of multi-volume storage in Clickhouse. The tables that use S3-compatible storage experience higher latency than local tables due to data storage in a container rather than on a local disk. SSH to the Supervisor and stop FortiSIEM processes by running: Attach new local disk to the Supervisor. If Elasticsearch is chosen as Online storage, depending on your elasticsearch type, and whether you have archive configured, the following choices will be available in the GUI. When Cold Node disk free space reaches the Low Threshold value, events are moved to Archive or purged (if Archive is not defined), until Cold disk free space reaches High Threshold. ClickHouse allows configuration of Hot tier or Hot and Warm tiers. Similarly, the space is managed by Hot, Warm, Cold node thresholds and time age duration, whichever occurs first, if ILMis available. For further information, please visit instana.com.
Note - This is a CPU, I/O, and memory-intensive operation. To do this, run the following command from FortiSIEM. If not specified, each table has a default storage policy default, which stores the data in the path specified in path in the configuration file. So it is advisable to keep an eye on the logs while the migration is running. MinIO support was originally added to ClickHouse in January 2020, starting with version 20.1.2.4. Set up ClickHouse as the online database by taking the following steps. Generally, in each policy, you can define multiple volumes, which is especially useful when moving data between volumes with TTL statements. This query will download data from MinIO into the new table. PersistentVolumeClaim must exist in the same namespace as the pod using the claim. Note: This is will also stop all the events from coming into Supervisor. After upgrading Clickhouse from a version prior to 19.15, there are some new concepts how the storage is organized. Edit /etc/fstab and remove all /data entries for EventDB. Elasticsearch must be configured as online storage, and HDFS as offline storage in order for the Archive Threshold option/field to appear in the configuration. It is recommended that it is at least 50~80GB. For appliances they were copied out in Step 3 above. If the same disk is going to be used by ClickHouse (e.g.
Use this option when you have FortiSIEM deployed in AWS Cloud and you want to use AWS OpenSearch (Previously known as AWSElasticsearch). Before we proceed, we will perform some sanity checks to ensure that MinIO is running and accessible. Policies can be used to enforce which types of event data stays in the Online event database. in hardware Appliances), then copy out events from FortiSIEM EventDB to a remote location. archive_low_space_warning_threshold_GB=20. When disk space is less than 10%, data will be purged until a minimum of 20% disk space is available. Applications (users) refer StorageClass by name in the PersistentVolumeClaim with storageClassName parameter. As we still ingest new data this process can take a few hours to complete. # echo "- - -" > /sys/class/scsi_host/host0/scan, # echo "- - -" > /sys/class/scsi_host/host1/scan, # echo "- - -" > /sys/class/scsi_host/host2/scan. When the Archive becomes full, events are discarded. There are two parameters in the phoenix_config.txt file on the Supervisor node that determine when events are deleted. When the Online Event database size in GB falls below the value of online_low_space_action_threshold_GB, events are deleted until the available size in GB goes slightly above the online_low_space_action_threshold_GB value. Luckily for us, with version 19.15, Clickhouse introduced multi-volume storage which also allows for easy migration of data to new disks. This feature is available from ADMIN>Setup >Storage >Online with Elasticsearch selected as the Event Database, and Custom Org Assignment selected for Org Storage. Note that two tables using the same storage policy will not share data. From the ESService Type drop-down list, select Native, Amazon, or Elastic Cloud. Stop all the processes on Supervisor by running the following command. You may also use it as one of ClickHouses storage disks with a similar configuration as with AWS S3. Log into FortiSIEM GUI and use the ANALYTICStab to verify events are being ingested. So we decided to go for a two disk setup with 2.5TB per disk. Depending on whether you use Native Elasticsearch, AWSOpenSearch (Previously known as AWSElasticsearch), or ElasticCloud, Elasticsearch is installed using Hot (required), Warm (optional), and Cold (optional, availability depends on Elasticsearch type)nodes and Index Lifecycle Management (ILM) (availability depends on Elasticsearch type). Use this option when you have an all-in-one system, with only the Supervisor and no Worker nodes deployed. (Optional) event data is written to HDFS archive at the same time it is written to online storage, when enabled. This is done until storage capacity exceeds the upper threshold. If you want to change these values, then change them on the Supervisor and restart phDataManager and phDataPurger modules. lvremove /dev/mapper/FSIEM2000Gphx_hotdata : y. Delete old ClickHouse data by taking the following steps. The easiest way to familiarize yourself with MinIO storage is to use a version of MinIO in a Docker container, as we will do in our examples. Specify special StorageClass. There are three elements in the config pointing to the default disk (where path is actually what Clickhouse will consider to be the default disk): Adjust these to point to the disks where you copied the metadata in step 1. For VMs, they may be mounted remotely. We reviewed how to use MinIO and ClickHouse together in a docker-compose cluster to actively store table data in MinIO, as well as import and export data directly to and from MinIO using the S3 table function. Stop ClickHouse Service by running the following commands. The user can define retention policies for this database. phtools -stop all. (Optional) event data is written to NFS archive at the same time it is written to online storage, when enabled. Clickhouse now has the notion of disks/mount points, with the old data path configured in server.xml being the default disk. You may have noticed that MinIO storage in a local Docker container is extremely fast. All this is reflected by the respective tables in the system database in Clickhouse: More details on the multi-volume feature can be found in the introduction article on the Altinity blog, but one thing to note here are the two parameters max_data_part_size and move_factor, that we can use to influence the conditions under which data is stored on one disk or the other. At the Org Storage field, click theEdit button. Now that you have connected to the ClickHouse client, the following steps will be the same for using a ClickHouse node in the docker-compose cluster and using ClickHouse running on your local machine. To use the table function with MinIO, you will need to specify your endpoint and access credentials. For the following cases, simply choose the new storage type from ADMIN > Setup > Storage. For VM based deployments, create new disks for use by ClickHouse by taking the following steps. Applications (users) claim storage with PersistentVolumeClaim objects and then mount claimed PersistentVolumes into filesystem via volumeMounts+volumes. To add a custom Elasticsearch group, take the following steps. Now, we are excited to announce full support for integrating with MinIO, ClickHouses second fully supported S3-compatible object storage service. From the Event Database drop-down list, select EventDB on NFS. Stay tuned for the next update in this blog series, in which we will compare the performance of MinIO and AWS S3 on the cloud using some of our standard benchmarking datasets. These are required by clickhouse, otherwise it will not come back up! When the Archive Event database size in GB falls below the value of archive_low_space_action_threshold_GB, events are purged until the available size in GB goes slightly above the value set for archive_low_space_action_threshold_GB. This is set by configuring the Archive Threshold fields in the GUI at ADMIN > Settings > Database > Online Settings. Custom Org Assignment - Select to create, edit or delete a custom organization index. else, if Archive is defined then they are archived. This can be Space-based or Policy-based. Click Save.Note:Saving here only save the custom Elasticsearch group. The natural thought would be to create a new storage policy and adjust all necessary tables to use it. FortiSIEM provides a wide array of event storage options. Policies can be used to enforce which types of event data remain in the Archive event database. We have included this storage configuration file in the configs directory, and it will be ready to use when you start the docker-compose environment. In addition, by storing data in multiple storage devices to expand the storage capacity of the server, clickhouse can also automatically move data between different storage devices. Note: This is a CPU, I/O, and memory-intensive operation. This is the only way to purge data from HDFS. However, to keep our example simple, it only contains the minimal structure required to use your MinIO bucket. When Online database becomes full, then events have to be deleted to make room for new events. If the data was diverging too much from its replica, we needed to use the force_restore_data flag to restart Clickhouse. For more information, see Viewing Archive Data. Go to ADMIN > Settings > Database > Online Settings. This bucket can be found by listing all buckets. Navigate to ADMIN>Setup >Storage > Online. For information on how to create policies, see Creating Online Event Retention Policy. Originally published on the Altinity Blog on June 17, 2021. There are two parameters in the phoenix_config.txt file on the Supervisor node that determine the operations. in hardware Appliances), then delete old data from FortiSIEM, by taking the following steps. The following sections describe how to set up the Online database on ClickHouse: [Required] the file path on the ClickHouse Server which will be mounted for the configured tiers. From the Storage Tiers drop-down list, select 1. Note that you must run all docker-compose commands in the docker-compose directory. From the Event Database drop-down list, select Elasticsearch. Then, we will check that the three ClickHouse services are running and ready for queries. Wait for JavaQuerySever process to start up. (Optional) Import old events. Click Deploy Org Assignment to deploy the currently configured custom org assignment. Log in to the FortiSIEM GUI and go to ADMIN > Settings > Online Settings. You can use the Search field to locate any existing custom Elasticsearch groups. When the Online Event database size in GB falls below the value of online_low_space_action_threshold_GB, events are deleted until the available size in GB goes slightly above the online_low_space_action_threshold_GB value.
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