Backup proxmox host. 3 Following the Proxmox Backup Server upgrade.

xxxx. Apr 10, 2022 · To backup your Proxmox host, you will need to first create a backup file. Jul 27, 2017 · Ja, /etc sollte im normalfall reichen. You can configure remotes in the web interface, under Configuration -> Remotes . Now we should add the Proxmox Backup Server as a remote storage in Proxmox VE. To schedule a backup job, follow these steps: Click the Datacenter node on the top, select the Backup option, and then click the Add button. Feb 2, 2021 · 373. To swap the disk I do this: Code: # pvesm set backup -disable 1. Server Installation. Container backed up to this storage should be then encrypted by default, VMs too but, IIRC, there maybe something missing. We think our community is one of the best thanks to people like you! Jan 17, 2024 · Step 2: Create Proxmox VM Backup. Proxmox Backup Server is an enterprise-class client-server backup software that backups virtual machines, containers, and physical hosts. Use drive from Proxmox Backup Server configuration. #1. Jun 13, 2011 · I'm new to Proxmox Backup Server and I'm really having a hard time understanding backup retention. Check out which /dev/sddX partition one is bigger and has a filesystem on it, that's the one . Only changes since the previous sync get transferred. B. 6 The backup server comes stocked with all the essential management tools you need, as well as an easy-to-use, web-based interface. It's easy to start: Just download the ISO image and install Proxmox VE on your hardware. Dec 1, 2022. Apr 13, 2024 · When setting up Proxmox (for the first time), it asked about my IP address which I provided (e. auch per cron + proxmox-backup-client regelmäßig auf dein PBS sichern. It provides easy management with a command line and web-based user Jan 16, 2024 · The use of command line tools is an efficient method when implementing file-level backups of Proxmox host configuration files. Common types are . Now facing the second time Proxmox installation suddenly broke, no way to recover it but a complete reinstall. --- switch disk ---. We’ll start with nothing and end up with a fully functional Proxmox Backup Server In short, the rule states that one should create 3 backups on at least 2 different types of storage media, of which 1 copy is kept off-site. 1 Check Status of Services. proxmoxer. 01 KB. # pvesm add pbs store2 --server localhost --datastore store2. Step3. Jun 17, 2022 · Select a backup job and click "Run now" button to create backup of your containers and VMs immediately. PBS team has "backup for Proxmox hosts" in their road map by the way, so this approach must be close to the view Proxmox developers themselves have on the problem. Learn how to protect your virtual machines, containers, and files with Proxmox Backup Client. The Some guests are not covered by any backup job message on the backup page gives you a hint that certain 2 days ago · The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway. Seems that the setup process creates a static IP address for the machine. We backup to a Synology NAS via CIFS and that works very well, something to consider. Hello, my PBS-server runs in a VM on a Proxmox VE node. This allows you to avoid network congestion and prioritize traffic from certain hosts. The proxmox-backup-debug command-line tool can be used to inspect such files and recover their contents. Proxmox Backup Server is a custom Linux distro that you can run on your server to have it serve as a backup endpoint. In this step by step tutorial, we install and configure Proxmox Backup Server (PBS) and back up all of our virtual machines. The Bare-metal server is based on the Debian Linux distribution, with some extended features, such as out-of-the-box ZFS support and Linux kernel 5. My PVE is installed on two mirrored SSDs (RAID1). 2. com/linux-backup-download. proxmox. See full list on dannyda. 3) Proxmox VMs and CTs (apart from PBS) backed up to PBS that saves the data to /mnt Jun 3, 2020 · A simple way to copy files from a physical machine to a virtual machine in Proxmox without having to setup shares or anything else is to create an ISO of the files using something like AnyToISO and upload to the Proxmox ISO store (ISO Images). Sep 15, 2020 · I'd then rather suggest installing Proxmox Backup Server and Proxmox VE along side on the same host, without CT or VM separation. The fingerprint of the Proxmox Backup Server API TLS certificate. But, if it solves our Backup demands, one has probably to bite the bullet Jun 4, 2019 · hello community, First of all, I apologize for my English. Here, if the host boot really fails, you could always just use a PBS ISO + a USB drive and install it there to get a running backup server with all your data (provided that was on another storage than the OS) again up and running. [4] 4 days ago · Allows you to create/delete/stop instances in Proxmox VE cluster. All commands support the following parameters to specify the tape device: --device <path>. In five minutes you'll be creating your first virtual machines and containers. Proxmox Backup Server is available now as free open-source software. Jan 17, 2022 · I installed Proxmox on 3 new server and all the procedure from the iso went ok. To access and download the centralized software stack, visit the official Proxmox downloads page. Select ‘Volume level backup’ and press Next. In this example, we are saving the configuration backup files to a Synology NAS. Install Proxmox Backup Server on Debian. Jul 25, 2020 · Proxmox Backup Server is an enterprise-class client-server backup software that backs up virtual machines, containers, and physical hosts. You will see the backup progress in the "Tasks" section at the bottom of the Proxmox web UI. #3. With that backup, you can restore most everything in Proxmox. 3 Following the Proxmox Backup Server upgrade. Under Backup File, enter a name for your backup file and then click the Create button. , upon every backup, a full copy of the VM must be created and stored. Secure Boot support. Give your backup job a name (e. Proxmox Backup Server enables you to pull or synchronize datastores to other locations for redundancy. encryption-key A key to encrypt the backup data from the client side. My setup is a baremetal Unraid 6. 4 Check Result & Reboot Into Updated Kernel. 3. I think the consensus from other posts is essentially that you just backup your entire /etc/ folder and any other custom configuration / software you did on the host itself outside of Proxmox proper. May 12, 2023 · Proxmox incremental Backup. Proxmox Backup Server support backup secara incremental dan deduplicated backup dimana ukuran storage akan di optimasi dan file yang sama tidak akan di backup 2 kali. So you can use that to backup the whole system disk or just some config file folders. Kannst du z. Click on Storage from the right side. Main Page. Last Updated May 06, 2024. May 17, 2023 · Such a backup tends to be around 2 GB and, considering the deduplication PBS provides, subsequent backups will consume far less additional space, so this is not a concern. The backup command takes a list of backup specifications, which include the archive name on the server, the type of the archive, and the archive source at the client. udemy. But I would like to have an actual backup of my PVE just like VMs. Dec 28, 2019 · As it also supports native KVM systems, it looks like a suitable solution to work with Proxmox too, although it looks like it has to be installed directly on the PVE host, which we usually try to keep as clean as possible. So you mount that usb drive on that other server and then you share that directory with samba over the network. Enter the username and its password to access Proxmox VE dashboard. Then head over and click the ‘ Backup now ‘ tab. 0. At Rsync, you can use -u to make incremental backup. 2 ISO Installer . may be skipped if you already added the PVE or PBS package repository You are now able to build using the Makefile or cargo itself, e. Backup Proxmox Configuration Files SSH into Proxmox Server Nov 4, 2020 · The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway. For now you mount it anywhere, e. 14 GB Jan 26, 2023 · Proxmox allows you to schedule backup jobs where you can back up selected or all VMs on all nodes. Dec 3, 2023 · The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway. Repository Access Behind HTTP Proxy. Microsoft’s currently supported version of Edge. It is specially optimized for the Proxmox Virtual Environment platform and allows you to backup and replicate your data securely. Proxmox Backup Client-only Repository. 3 Upgrade the System. Hello everyone, I want to migrate an entire virtual machine from one Proxmox VE server to another On the server where the virtual machine is located, I execute the command vzdump 106 --dumpdir /root --mode stop after using scp I am transferring this image to a server where I want to deploy a copy of this virtual machine scp pmt ¶. Chrome, a release from the current year. Most of the time the recommendation is the opposite. Enter in the ID you’d like to use and set the server as the IP address of the Proxmox Backup Server instance. Proxmox Backup Server is an enterprise backup solution for backing up and restoring VMs, containers, and physical hosts. Then in your virtual machine's Hardware settings add a CD/DVD Drive (if there's not one already there Proxmox backup is a process of copying and restoring VMs & containers running on the Proxmox Virtual Environment (VE). Mar 5, 2020. Jan 18, 2020 · shop. File Size 2. In Proxmox Backup, this works through the use of Remotes and Sync Jobs. And the Synology forwards it to the cloud. Check out the full documentation of the upgrade I‘d like to have your opinion or some reference to howtos or manuals about how to backup/restore Proxmox VE Host. 81. Since community. We think our community is one of the best thanks to people like you! With Proxmox Backup Server, you can constrain network traffic for clients within specified networks using a token bucket filter (TBF). Click the Add button and select the Directory option. The following example uses store2 as the storage's name, and assumes the server address is localhost and you want to connect as user1@pbs. The USB drive will be auto-mounted when PVE does its disk checks, takes a minute or so. Auf dem NUC ist Proxmox installiert. So if one drive craps out, technically I should be ok by just replacing the failed drive. <type>:<source-path>. You can get it in the Servers Dashboard or using the proxmox-backup-manager cert info command. The next step is to prepare the virtual machine backup. Add a Comment. Jan 18, 2020 · The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway. PBS was designed with local SSDs as storage in mind because it needs a high IOPS performance and isn't doing sequential IO. : Best. Mar 18, 2024 · Proxmox comes with Proxmox Backup Server, a native tool to back up virtual machines. Enter the username as root@pam, the root user’s password, then enter the datastore name that we created earlier. pxar for file archives and . g. zst destination/dir Restoring a Proxmox Backup Proxmox Backup Server 2. Command line tools such as “cp”, “tar”, and “rsync” provide flexibility and customization, allowing users to selectively back up specific directories and files without having to copy the entire system. But you can use the proxmox-backup-client to backup any file/folder/block device you want. I have a cluster with 10 nodes and I am backing them up with proxmox backup server. However, Proxmox Backup Server is an optional backup solution that can be installed on a Proxmox environment to perform backup and restore Jun 1, 2019 · There is no easy way to backup a PVE/PBS host yet. Feb 15, 2023 · Open the Proxmox VE Admin web interface by navigating to URL https://proxmox-ve-ip-address:8006 from your web browser. Dec 8, 2023 · PVE2IP is to be replaced with actual IP address of destination Proxmox server; We’re copying the backup to the /var/lib/vz/dump/ in the destination server; Restoring VM from Backup archive on Proxmox Server. Make sure to mark it as a mount point. Jul 3, 2024 · Proxmox Backup No-Subscription Repository. Proxmox Backup Client Usage is a comprehensive guide on how to use the proxmoxbackupclient command to backup and restore data from Proxmox Backup Server. general 4. Proxmox Backup Test Repository. Version 2. 4 ISO Installer . See also Apple iCloudBackup Macbook. Ansonsten kannst du auch gelegendlich bei einer geplanten Wartung mal in ein Clonezilla booten und dann ein blocklevel Backup der ganzen Boot/System-Disks machen und das in ein Image speichern. veeam. Confirm the ID for the drive (as previously configured). Installasi dan Konfigurasi Untuk instalasi bisa melalui 2 cara yaitu dengan menggunakan ISO dan Install Via CLI (Debian) Apr 4, 2023 · Alternatively, you can use the commandline tool [1]. With the bare-metal installation, you'll get a complete operating system Apr 29, 2022 · To fix this, I have to reboot the host. 11. Just double click on it to view the verbose output. The workers transfer the VM data from the Proxmox VE host to the backup repository; similar to the workers in Proxmox Backup Server is an enterprise-class, client-server backup solution that is capable of backing up virtual machine s, container s, and physical hosts. Commands which generate output support the --output-format parameter. It only happens when I do "stop" mode backup while the VM is running. 3. But given enough backup attempts, it will eventually fail. PBS is a dedicated backup solution and thus, comes with many extra features that provide a significantly better experience. But you then of cause need to know what to back up and how to use the client in CLI. At the NFS screen, create an ID, then enter the IP Address of your Synology NAS server. On the computers screen press ‘Add’ --> 'Individual Computer' and enter your Proxmox host, and the credentials we created earlier: 5. On the pop-up that appears, select your backup storage. Path to the Linux tape device. By supporting incremental, fully deduplicated backups, Proxmox Backup Server significantly reduces network load and saves valuable storage space. Do not use real domain names ever, you will just be flooding authoritative nameservers with useless requests or the host will even try to start sending cron emails to that domain and so on and so on. That is not true. 28. We think our community is one of the best thanks to people like you! Nov 30, 2023 · Select Datacenter, Storage, then Add. Version 3. x . Below is the usage help page. 1. Proxmox Backup Server is an enterprise backup solution, for backing up and restoring VMs, containers, and physical hosts. Aug 27, 2019 · The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway. We would like to show you a description here but the site won’t allow us. The Proxmox Backup Server subscription model is based on the number of servers including unlimited backup storage and unlimited backup-clients. We can use it as a solution to back up and restore virtual machines, containers and physical hosts. our goal is to use the cubbit service (S3 Feb 18, 2022 · Veeam login/create account:https://www. In our case, we have a secondary hard drive labeled ‘ backup ‘ with a capacity of 52. In the Export drop-down menu, the location of your Proxmox folder should automatically appear. It accepts the following values: Apr 25, 2024 · Proxmox Backup Server 3. Veeam’s innovation in the field of data management Mar 9, 2021 · Mar 18, 2022. The format is: <archive-name>. Proxmox Backup Server (short Proxmox BS) is an open-source backup software project supporting virtual machines, containers, and physical hosts. antikotah. Sep 9, 2021. 06 MB May 14, 2024 · Now, Veeam is excited to announce its upcoming support for Proxmox VE, adding yet another robust platform to its extensive ecosystem. Install Proxmox Backup Server using the Installer. To access the backup file, SSH into your Proxmox server as so : ssh [email protected] The backup is stored in the following directory and will be in . 5, another baremetal Proxmox VE, with a HP Aruba Instant On 1930 8G 2SFP Switch Dec 4, 2023 · Proxmox Backup Server (PBS) is a free solution based on the Debian operating system from Proxmox for backing up Proxmox VE virtual machines and container instances. Darunter habe ich dann mehrere Server als VM laufen. 6. ago. Proxmox Backup Server provides tools for storing extra copies of backups in remote locations and on various types of media. 1) When are full backups performed When I configure a backup for a server I just configure a backup. Apr 15, 2021 · UdoB said: When you create a backup task via "Server View" --> "Datacenter" --> "Backup" --> "Create: Backup Job" you can select which VMs shall be included. 14 GB. Proxmox, however, is saved full VM every time. This allows for simple, out-of-the-box management of your server, either through the command line or a standard web browser. Click "Yes" to start the backup task. Jul 21, 2012 · If you want to enable this on another server, maybe just create a share with credentials with Samba. 2. e. Von jeder VM habe ich auch zusätzlich noch einen Clone erstellt, damit ich bei Bedarf schnell und einfach meinen Server wiederherstellen kann. Parameters Jul 30, 2021 · 21. Jun 4, 2024 · Proxmox Backup Server. It covers the installation, configuration, options, and examples of the command. 2-3). File Size 100. 2) Proxmox Backup Server in LXC container backed up by Proxmox VE schedule on NFS share. How can I only create backup from changed data or only make the changes backup and not full bacup also incremental Backup. VAT will be added, if applicable. 7. This is an efficient method to synchronize data to offsite locations. The open-source solution supports incremental backups, deduplication, Zstandard compression, and authenticated encryption. htmlLink to Putty for SSH:https:// Proxmox Backup Server 2. com Feb 1, 2024 · To create a backup, we use the Proxmox backup client “backup” command, which requires the following syntax: proxmox-backup-client backup {<backupspec>} [OPTIONS] Where <backupspec> is the list of sources to backup in the form: <label. 06 MB A remote refers to a separate Proxmox Backup Server installation and a user on that installation, from which you can sync datastores to a local datastore with a Sync Job. Hi, The other backup targets in Proxmox VE are simply storage devices, and as a result, can only support full backups, i. To my question: If the storage of the Proxmox node (running the virtual PBS-server) gets broken, I need to reinstall PBS on a new node and add the existing backup datastore (of the old PBS-server) to that new Proxmox Jan 2, 2020 · Ich habe ein Intel NUC als Smarthome-Server am Laufen. Last Updated April 25, 2024. 2 Add the Proxmox Backup Server 3 Package Repository. Proxmox Backup Server. Select Datacenter then Storage. The module automatically detects containerization type (lxc for PVE 4, openvz for older). I understand that the backups are always incremental. as you already know which block device the data is one you just need to find out which sub-partition is required, the following command should help: lsblk -o +FSTYPE,UUID /dev/sdd*. So it was never meant to run on HDDs or remote filesystems (but atleast here NFS and HDDs run fine but slow). Very strange that there are build-in options to backup and replicate VM's, LXC, etc, but not the Proxmox host. With strong encryption and methods of ensuring data integrity, you can feel Dec 12, 2023 · I named mine "backup". Wenn du aber das ganze PVE System sichern willst solltest du lieber Debian auf einem USB Stick oder so installieren und dort dann das proxmox-backup-client Package hinzufügen. --drive <name>. In addition, it ships variants of the GRUB bootloader, MOK utilities and kernel images signed by Proxmox and trusted by the shim bootloader. Dec 11, 2022 · Just wanted to share my experience with installing Promox Backup Server as a VM in Unraid as I encountered some problems that I wasn't able to find any answers on the internet. Access Proxmox VE Dashboard. Oct 24, 2023 · 2. Run Proxmox Backup. What Get Started. 2 days ago · The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway. Besides the Veeam Backup Server and at least a Backup Repository, Veeam Backup for Proxmox will utilize workers. Proxmox VM Backup. Of course you need to do this for each and every single VM if you want independent schedules or options. We think our community is one of the best thanks to people like you! Dec 18, 2023 · In general pbs does not offer file level backups, nor direct RClone integration, but VM backups and LXC Container Backups, therefore i'd run RClone in a VM on PVE, where the backups of the cubbit DS3 bucket are stored and then backup the VM to PBS. com/Link to Veeam Agent for Linux:https://www. . It provides easy management with a command line and web-based user Using the Proxmox VE Command Line ¶. . This will trigger Proxmox VE to transfer the backup of the selected VMs to a remote storage location. I would like to ask for your help in the following. requests. If I try from ssh console to connect Dec 15, 2023 · or Full Course Join Here : https://www. 2 Optional: Disable Maintenance Mode Again. Und ja, mit dem proxmox-backup-client kann man wunderbar die PVE Konfigs etc sichern. Supported web browsers for accessing the web interface. Jul 5, 2024 · The Proxmox integration itself will be enabled with an additional plug-in, which is installed on the Veeam Backup Server. Apr 25, 2024 · Improved management of Proxmox Backup Server machines. B. 1 Update Debian Base Repositories to Bookworm. Click on Datacenter from the left navigation pane. However, you may need to use advanced backup/recovery features such as direct backup to the cloud, application-aware backup, flexible scheduling and retention, immutability, granular recovery, etc. Of course, Proxmox Backup Server is not exactly a third-party solution in the context of Proxmox VE, since it is distributed using the official Proxmox website in the first place. All prices are net prices. With Veeam’s support, businesses using Proxmox VE will soon be able to leverage Veeam’s powerful backup solutions for comprehensive data protection. I recently purchased veeam backup and would like to backup my proxmox backup server. You need to define a new storage with type 'pbs' on your Proxmox VE node. Where I can do a restore and be back up and running fairly quickly. It integrates quickly and easily with P Main Page. blob files. 2-1. #2. Mar 14, 2024 · Hit the VM > Backup > Backup now > choose the remote storage previously set up (Remote-backup) in the Storage > click Backup. Looking for the best option to backup my actual Proxmox host. Proxmox Backup Server now ships a shim bootloader signed by a CA trusted by most hardware's UEFI implementation. Proxmox Backup Admin Guide 3. After a successful backup, you will see the message Task OK at the end of the output. For example, to get a list of the referenced chunks of a . Best would be to have a local PBS server using SSDs and a second offsite PBS server and then Aug 6, 2022 · Der sollte schon vorinstalliert sein. 4-1. Required for self-signed certificates or any other one where the host does not trusts the servers CA. The downloadable ISO image can be used on bare-metal systems via the installation wizard. 4 LTS. It is implemented as a dedicated Linux distribution based on Debian, and supports essential features like deduplication and encryption. zst format. Personally I do backup of pools. com/course/proxmox-virtualization-environment-complete-training/?referralCode=8E7EAFD11C2389F89C11Recommended ha May 3, 2018 · In VBR create a new backup job (pick Linux Computer) 2. HI, I'm sorry, probably my english is not very clear. My setup: 1) Proxmox VE installed on Intel NUC on nvme0. The qmrestore command is used to restore QemuServer vzdump Backups. SHA256SUM Feb 17, 2023 · Type the following command to mount the drive and make it visible to the Proxmox server and press Enter: mount -a. The backup process will now start and will take some time to complete. Proxmox Backup Server is free and open-source software, published under the GNU AGPL, v3 Mar 30, 2020 · Agree, Comporder1. By setting up a remote Proxmox Backup Server, you can take advantage of the Apr 24, 2024 · Proxmox Backup Server 3. Now, after a reboot I cannot access to web interface from any server: login to ssh its ok but from web interface (tested in many browser) always return connection refued. Using PBS helps protect your critical data from accidental deletion, corruption, ransomware, or other Remote synchronization. File Size 822. As it is now, I cannot see my Proxmox server in my list of network devices on my dhcp server. xxx. fidx index: The same command can be used to inspect . Jan 28, 2024 · Proxmox backup server is a free and open source, enterprise-level backup solution. com. You can then scp the file to your desired location: cd /var/lib/vz/dump scp vzdump-qemu-100. You can manage the traffic controls either via the web-interface or using the traffic-control commands of the proxmox-backup Jun 20, 2020 · Jul 14, 2020. Any idea on how to diagnose this? This does not occur if I manually reboot the VM. Install Proxmox Backup Server Unattended. Requirements The below requirements are needed on the host that executes this module. Download. We think our community is one of the best thanks to people like you! Proxmox Backup Server Datasheet . It is specially optimized for the Proxmox Virtual Environment platform and allows you to back up your data securely, even between remote sites, providing easy management through a web Jan 19, 2020 · chotaire said: Yes that is a very bad idea. Try BDRSuite's Proxmox backup solution for free! Oct 22, 2023 · We’ll then be able to backup Proxmox to a Synology NAS. We think our community is one of the best thanks to people like you! Jan 25, 2021 · Feb 3, 2021. ext>:<path>. The source code of Proxmox VE is licensed under the GNU AGPLv3 and free to download and use. The backup datastore is mounted (CIFS) on a QNAP-NAS. To do this, open the Proxmox web interface and navigate to the Backup tab. So click ‘ Backup ‘. It provides secure Proxmox Backup Server storage and data management features. So I hope somebody can answer a couple of my questions. I configured cluster and tested it, all work like a charm. Hi, In Proxmox Docu it stands that backups are made incremental. Hi, you can create a autogenerated key for a storage using: pvesm set <storage-id> --encryption-key autogen if you use a recent enough libpve-storage-perl package (>= 6. 0 Availability. 5. 0 on, there are no more default values. Select Proxmox Backup Server from the dropdown menu. To access the web-based user interface of the Proxmox Backup server, you need one of the following browsers: Firefox, a release from the current year, or the latest Extended Support Release. Select Add then NFS. #pvesm set backup -disable 0. 15). Proxmox Backup Server is licensed under the GNU AGPLv3 and is free to download and use. Also it is not consistent: the VM might boot normally after the backup. Subscription period is one year from purchase time. Without the --decode parameter, just the size and the encryption type, if any, are printed. File Size 1. ‘Backup Proxmox01 LVM-THIN01’) 4. • 2 yr. Sep 17, 2023 · Safeguarding your server’s configuration is essential, and in this guide, we’ll show you how to create backups of Proxmox configuration files and restore them when needed. # umount /mnt/backup. 52GB. # cd proxmox-backup; sudo mk-build-deps -ir Note: 2. If you set up a new Proxmox VE server and want to restore backed-up VMs and CTs, add the PBS the way you did on the first, now dead, machine; in the web interface of your new Proxmox VE, go to Datacenter->Storage-> add-> Proxmox Backup Server. img for block device images. Jun 28, 2023 · Proxmox Backup Server 3. sk td si lu bm hf pv ui bf ct