Xpra shadow

Xpra shadow


  • MacOS – Sharing GUI windows between Macs
  • Note 1071404 - Add. info.: Upgrade to SAP CRM 2007 ABAP
  • Index – Upgrading SAP®
  • XPRA 사용 방법
  • Linux-Fu: Applications On The Web
  • MacOS – Sharing GUI windows between Macs

    Choose the direction of the clipboard synchronization. This value may be used in notifications, utilities, tray menu, etc. Setting this value on the server provides a default value which may be overridden on the client. The default option is auto which allows the server to select the best encoding automatically. Fast at encoding and decoding. The default encoding which is automatically selected if you do not specify one will depend on what options are available on both the server and the client: rgb is always available builtin , jpeg and png require the Python Imaging Library, vp8, vp9, webp, h and h all require their respective shared libraries, as well as the xpra codec that uses them.

    Note: when selecting a video encoding usually h, vp8 or fBvp9 , it will only be used if the screen is updating quickly enough, some of the smaller screen updates will also be sent using one of the other non-video encodings. Video scaling is normally used with video regions or very large windows especially full screen windows to try to maintain a decent framerate. Video downscaling negatively affects visual quality and will cause automatic refreshes if enabled , it is most useful on video content where it saves a considerable amount of bandwidth.

    If unspecified, the first value from socket-dirs will be used. The paths will be expanded. This may be a security risk if you are using xpra to constrain what the clients can execute on the server. The value may be specified using standard units, ie: 1Mbps or K. This can be used to prevent that behavior useful mostly for debugging.

    If the file has not been replaced, it will be deleted when the server exits. This option can be specified multiple times to specify multiple socket locations. These sockets support local connections with the style display address, and remote connections with the ssh:frodostyle display address. If the host portion is omitted, then If you wish to accept connections on all interfaces, pass 0. Anyone at all may connect to this port and access your session.

    UDP sessions are trivial to hijack for anyone able to sniff even just a single packet, it should only be used in very specific use-cases, and never over unsecured networks. Note: this command line option may be exposed to other processes on the same system.

    The contents of this file will be treated as binary data, there are no restrictions on character encodings or file size, but since older versions did have more restrictions it is best to avoid special characters, in particular: non-ASCII characters, control characters like newlines and carriage returns, and the pipe character.

    Multiple displays may be specified as a comma separated list. Posix only, and not available on Mac OS See hosts. The command should return 0 to allow access, any other value will deny access. This authentication module is only available on some Posix compliant operating systems. This module will verify that the operating system provides the uid and gid of the process that initiated the connection.

    Access can be restricted by supplying in CSV format the list of valid uids and gids that are allowed to connect. This module is different from the others in that it will not require the client to supply a username or password, as those are ignored. You can use a lower value to allow unprivileged users to bind to privileged ports when starting sessions via the system wide proxy server.

    The default value is which is the standard value for privileged ports. Some features may not be available without a dbus context. This option may be given multiple times to start multiple commands. This does not affect server exit. With auto mode, this delegation will only occur if the system wide proxy server is found.

    You are responsible for starting the display yourself. This can also be used to rescue an existing display whose xpra server instance crashed or for running xpra against an accelerated X11 server. If your Xvfb is installed in a funny location, or you want to use some other virtual X server, then this switch allows you to specify how to run your preferred X server executable.

    The default value used depends on your platform. Some applications like screen recorders may want to capture the window contents, you can use this option to enable painting with a configurable delay in milliseconds. Warning: this extra painting is expensive and quite slow, which is why it is not enabled by default.

    With the value auto, a client is started for remote servers only. This requires websockify to be installed and at least one TCP or local socket to be configured using the matching bind option.

    The auto mode will enable support if all the components are available. By default the server will provide access to the HTML5 client. You can also specify your own web root path as argument. This option is only applicable to servers started in start-desktop or shadow modes. By default, all of them are loaded, but one may want to specify a more restrictive list of encoders. By default, all of them are loaded, but one may want to specify a more restrictive list of modules.

    This is necessary to share the mmap file across user accounts. Defaults to The only cipher supported at present is AES, if the client requests encryption it will be used by both the client and server for all communication after the initial password verification, but only if the server supports this feature too. Note: this feature has not been extensively reviewed and as it is it should not be considered safe from determined attackers. The client and server must use the same keyfile contents.

    Use the value 0 to disable this timeout. Note: at present this only applies to copying from the machine where this option is used, not to it. This numeric value should be in the range 10 to to be useful. Many applications will only read this value when starting up, so connecting to an existing session started with a different DPI value may not have the desired effect.

    Possible values: 0 auto , 16, 24, When starting a client, this switch controls the picture rendering with the opengl backend: values higher than 24 will enable deep color, the value 24 enables regular true color rendering.

    Use the value 0 to let the client decide if the rendering will benefit from using deep color. This disables the feature. System notifications require the xpra server to have its own instance of a dbus daemon, if it is missing a warning will be printed on startup. This switch disables the feature entirely, and avoids the warning.

    The following METHODs are currently supported: none Disable input methods completely and prevent it from interfering with keyboard input. This is the default. You are responsible for ensuring it is correct. Any other value will also be set up, but will trigger a warning.

    Xsettings are only forwarded from posix clients connecting to real posix servers not shadows. This feature requires client support and may not be available on all platforms. The client can specify the value both to both send it to the server and keep it locally.

    The video data will be delayed so that it is displayed in sync with the audio. Note: this only applies to video regions, either auto-detected via the builtin heuristics or specified using the dbus interface. The default is to detect if the graphics card and drivers are supported auto mode , but one can also disable OpenGL no or force it enabled yes. On some platforms, it is also possible to specify which backends should be used, only gtk and native are currently supported and only on X11 platforms.

    The webcam device to use can also be specified. With the lz4 and lzo compressors, there are only two possible values: 0 meaning no compression and 1 compression enabled. The zlib compressor supports values between 0 meaning no compression and 9, inclusive. It should only be used when lz4 and lzo are not available. This compression is not used on pixel data except when using the rgb encoding. Values range from 1 lowest quality, high compression — generally unusable to highest quality, low compression.

    Specify a value of zero to let the system tune the quality dynamically to achieve the best bandwidth usage possible. Slower compresses more, faster will give better latency. The system normally uses a variable speed, this option forces a fixed speed setting to be used instead. The delay is a floating-point number and is in seconds. This option is enabled by default with a delay of 0. This option is only relevant when using a lossy encoding. These keys will be caught by the client and trigger the action specified and the key presses will not be passed on to the server.

    Some of the actions may allow arguments ie: the log action does , in which case they are specified in the usual programming style syntax: ACTION ARG1, ARG2, etc String arguments must be quoted both single and double quotes are supported and numeric arguments must not be quoted. Beware the the parenthesis and quotes must usually be escaped when used from a shell command line.

    Note 1071404 - Add. info.: Upgrade to SAP CRM 2007 ABAP

    In contrast to the release upgrade, the Software Update Manager requires the lock in this phase only. This lock prevents development objects for example, ABAP reports, table definitions, and so on from being changed during the update since these modifications would be lost. Some further actions might be blocked that either check for this lock as well or for the running update. This phase displays all the repairs that are still in open transport requests.

    LOG file. Release these transport requests so that you can continue; otherwise, the objects contained in these repairs are locked. Note SUM checks in this phase also for inactive development objects. Before you continue, you have to release and confirm all the open repairs; otherwise, the objects in them are locked. Fast Data Copy FDC is a table copy procedure that makes use of partly database-specific optimizations to get maximum copy performance.

    On these phases, data is imported on the shadow tables and on new tables. The shadow import is a feature aimed to reduce the application downtime caused by the import of the Support Packages.

    The idea behind this feature is to import, activate and convert all objects belonging to the Support Packages into a shadow repository, and at the end of all phases, switch to the new coding. The import of these packages is performed via the transport tools tp and R3trans.

    All SAP table classes S, W, E, C and G are affected by row insertions, modifications and deletions — except for class A, which is protected against row modifications, where only insertions are allowed. Here, several conversion program processes in the SAP system and tp processes run simultaneously. SUM starts the distributor in parallel jobs.

    The reports that are executed during XPRA are application-related conversions, adjustments, data mergers or alignments for the conversion of release-specific SAP-shipped customizing that need to be adjusted during the upgrade. The XPRA phase reports are run as one of the last steps of the upgrade. However, due to the fact that table content is adjusted, the XPRA phase needs to be done at application downtime.

    Index – Upgrading SAP®

    This phase displays all the repairs that are still in open transport requests.

    XPRA 사용 방법

    LOG file. Release these transport requests so that you can continue; otherwise, the objects contained in these repairs are locked. Note SUM checks in this phase also for inactive development objects. Before you continue, you have to release and confirm all the open repairs; otherwise, the objects in them are locked.

    Fast Data Copy FDC is a table copy procedure that makes use of partly database-specific optimizations to get maximum copy performance. On these phases, data is imported on the shadow tables and on new tables. The shadow import is a feature aimed to reduce the application downtime caused by the import of the Support Packages. The idea behind this feature is to import, activate and convert all objects belonging to the Support Packages into a shadow repository, and at the end of all phases, switch to the new coding.

    Here is a screenshot of a shell and a clock running inside Google chrome on a remote computer. Without the Browser The main emphasis seems to be using xpra as both a server and a client. You can provide read-only access, export sound, share printers, link clipboards, scale video, and more — if you have the patience to wade through the documentation. Security The biggest concern, of course, is security. You can set up xpra to use SSL authentication or passwords. You could also use a wrapper or port knocking to control access to a port.

    I decided to go a different route. What I did was let the xpra server run on an unused port locally, but I did not open the firewall for that port.

    In theory, then, anyone who could log into the machine could access the remote applications, but given this is a server with just a small number of administrators, they could all get into anything, anyway.

    Linux-Fu: Applications On The Web

    Granted, that makes the convenience of the browser-based client a bit less, but then again, ssh clients that can create tunnels are widely available, so for my case that was acceptable and it seems relatively secure. You can see how I do the ssh tunnel in the video below. You can set up xpra to provide a login screen that with a bit of configuration will even work with SSL.

    The problem is, the web interface puts the password into the URL which means your passwords will be floating around in your browser history.

    Probably not a good idea. Before you expose your Linux box to the world, be sure you understand how someone could break into it and take steps to protect yourself.

    But if it is on the Internet, people may want to take it over as a platform to launch attacks on other people using your hardware and Internet connection.


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