Linux slog

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Log in. For a better experience, please enable JavaScript in your browser before proceeding. ZFS crash on mountroot after removal of slog device. Thread starter Mike Selner Start date Dec 17, I have a production FreeBSD Expect reduced performance. People who knows zfs better will probably answer here, but I think that removing LOG devices from a zfs pool falls in the "don't do that" category; in effect - not supported, will not work etc.

Hello, Can you provide a citation for this? The zpool 8 man page says it is supported. It's unavoidable that a device can fail and it should not render a system unusable.

Worst case should be a rollback of a few recent updates. Indeed, the zpool man page says that it should be supported. However, reports that it might not work exists: ThreadThread ok, it is old.

I haven't tried this myself, so I do not know if any of this is accurate information. Did you notice this? Mike Selner said:. Agreed - how to resolve? Update - no replies on this, don't know if anyone has suggestions. I checked the history on the original pool and it was set up on 9. A few months later I added an identically sized vdev with mirrored devices ada2p3 and ada3p3. I built a new system with a similar setup including slog on ssd and shut down, unplugged the slog device to simulate a failure and rebooted.

The system came up fine and zpool status showed a missing log device.On Unix-like operating systems, the login command begins a new login session on the system. The login program is used to establish a new session with the system. It is normally invoked automatically by responding to the "login:" prompt on the user's terminal.

When called from a shell, login should be executed as exec login which will cause the user to exit from the current shell and thus will prevent the new logged in user to return to the session of the caller. Attempting to execute login from any shell but the login shell will produce an error message. The user is then prompted for a passwordwhere appropriate. Echoing is disabled to prevent revealing the password.

Only a small number of password failures are permitted before login exits and the communications link is severed. If password aging has been enabled for your account, you may be prompted for a new password before proceeding. You will be forced to provide your old password and the new password before continuing; refer to our passwd for more information.

An initialization script may also be executed; check the documentation of your command interpreter for information on init scripts. The given home directory will be used as the root of a new file system which the user is actually logged into. The -r-h and -f options are only used when login is invoked by root. Home Help Linux. Description Syntax Examples Related commands Linux commands help. Was this page useful?

Do not perform authentication ; user is preauthenticated. In that case, username is mandatory. Default is none. Use with caution - it is possible for users to gain permanent access to these groups, even when not logged in on the console. Indicate if login is allowed if we can't cd to the home directory. Default is no. If set, it will be used to define the PATH environment variable when a regular user login. If set, it will be used to define the PATH environment variable when the superuser logs in.

The value can be prefixed " 0 " for an octal value, or " 0x " for an hexadecimal value. If defined, this file can inhibit all the usual chatter during the login sequence.

If a full pathname is specified, then hushed mode will be enabled if the user's name or shell are found in the file.

RAID: Obsolete? New Tech BTRFS/ZFS and "traditional" RAID

If not a full pathname, then hushed mode will be enabled if the file exists in the user's home directory. Maximum number of login retries in case of bad password. Enable display of unknown usernames when login failures are recorded. Logging unknown usernames may be a security issue if a user enters their password instead of their login name, as the typo would then be logged.

What Is a LOG File?

By default, the ownership of the terminal is set to the user's primary group and the permissions are set to A file with the LOG file extension is a Log Data file sometimes called a logfile used by all kinds of software and operating systems to keep track of something that has occurred, usually complete with an event detail, date, and time. It could really be used for anything that the application deems appropriate to write down. For example, antivirus software might write information to a LOG file to describe the last scan results, like the files and folders that were scanned or skipped, and which files were marked as containing malicious code.

A file backup program could use a LOG file too, which could be opened later to review a previous backup job, read through any errors that were encountered, or see where the files were backed up to. A much simpler purpose for some LOG files is to merely explain the newest features that were included in the most recent update of a piece of software. These are normally called release notes or changelogs.

The data contained in these files are usually regular text files. You might be able to open a LOG file in your web browser too. To change a logfile format into something like CSVPDFor an Excel format like XLSXyour best bet is to copy the data into a program that supports those file formats, and then save it as a new file. As you can see, there's a message that the program wrote to the LOG file, and it includes the EXE file location and the exact time that each message was written.

Some might not be so nicely structured, though, and could be hard to read, like this LOG file created by a video converter tool :.

Others might even appear to be complete gibberish since there aren't any timestamps. In cases like this one, the log is written to a file with the. You can build your own LOG file in Windows using the built-in Notepad application, and it doesn't even need to have the. LOG file extension. Just type. Each time you open it, the current date and time will be appended to the end of the file. You can add text under each line so that when it's closed, saved, and then reopened, the message remains and the next current date and time is available.

If you get a permissions error or are told that you can't view the LOG file, chances are it's either still being used by the program and won't open until it's released, or that it was created temporarily and has already been deleted since the time you tried opening it. It might instead be the case that the LOG file is stored in a folder that you don't have permissions to. At this point, if your file still doesn't open like you think it should, double-check that you're reading the file extension correctly.

It should read ". LOG" but not. LOG1 or. Those latter two file extensions are associated with the Windows Registry as Hive Log files, and as such are stored in binary and unreadable with a text editor. Tweet Share Email.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.

sslogger-slogd(8) - Linux man page

Software is written for educational purposes and is distributed in the hope that it will be useful for anyone interested in this field. See examples directory for more informations. Note: Although, you can run slog without initialization, we recommend this action.

If you don't initialize slog, you'll only be able to export log messages in console. Also the default config values will be used. If the confing file is NULLthe default values are set. Values from the config file override the defaults. From version 1. In addition, we added the option to print the corresponding file name and line number where a slog macro was called. This rule follows the macros which relate to a critical flag, and shown bellow:.

You can colorize strings with strclr function. Usage is very simple, first argument is color value and second argument is string which we want to colorize. Argument is pointer of SlogDate structure. For example if you want to print system date which uses slog, code will be something like that:.

If argument is 1, it returns only version and build number. Otherwise it returns full version such as Build number, build name and etc. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. C Makefile. Branch: master.

Find file.

linux slog

Sign in Sign up. Go back.Petit is a free and open source command line based log analysis tool for Unix-like as well as Cygwin systemsdesigned to rapidly analyze log files in enterprise environments. In this tutorial, we will show you how to install and use Petit log analysis tool in Linux to pull out useful information from system logs in a various ways.

This is a straightforward petit function — it sums up the number of lines discovered in a log file. Using the --daemon option helps to output a basic report of lines produced by particular system daemon as shown in the example below. To find all the number of lines generated by a particular host, use the --host flag as shown below.

linux slog

This can be useful when analyzing log files for more than one host. This example shows how to track and graph a specific word e. Additionally, to show samples for each entry in a log file, use the —allsamples option like this. You can send us any queries via the feedback form below or perhaps share with us info about useful log analysis tools for Linux out there, that you have heard of or come across.

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Millions of people visit TecMint! If you like what you are reading, please consider buying us a coffee or 2 as a token of appreciation. We are thankful for your never ending support. Tags: Linux Log Management. View all Posts. Aaron Kili is a Linux and F. S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.

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Check out our Privacy Policy. Keep an eye on your inbox for a monthly roundup which includes all of the top content on Electromaker. Raspberry Pi boards are functional single-board computers SBCs capable of serving as a foundation for a smattering of projects. Raspbian remains a top choice, and one of the most popular Raspberry Pi Linux distros. However, there are plenty of additional Raspberry Pi desktop options. Check out the best OS for Raspberry Pi boards!

Before settling on a Linux operating system for your Raspberry Pi, think about your needs. Still, these offer loads of services. Moreover, you may dual boot for a multi-OS configuration. Further, you may not even require a graphical user interface GUI for some projects, so a barebones, roll-your-own distro may suffice. As the name suggests, Raspbian is a Debian-based operating system created for the Raspberry Pi. Because Raspbian comes standard with pre-installed software including Chromium, Minecraft Pi, and Mathematica.

While there are loads of Linux desktop operating systems, Ubuntu ranks as one of the most well-known. The Debian-based Ubuntu, in turn, spawned a series of Ubuntu derivatives ranging from Kodibuntu to Xubuntu and Lubuntu. Ubuntu Snappy Core targets Internet of Things IoT applications but differs from most Ubuntu releases in that it eschews apt-get software installation. Rather, it employs Snap installation. This Debian derivative aims as penetration testing pen testing and digital forensics.

As such, CentOS benefits from an enterprise-class environment. While most Linux distros afford increased control, Arch Linux takes this to the extreme. Arch takes the KISS, or keep it simple stupid, principle to heart, which places the onus on the user to comprehend its overall function.

Similarly, Gentoo is available for the Raspberry Pi. However, the user is responsible for installing everything else, including a desktop environment. A roll your own distro, Gentoo is best suited to those willing to slog through the ultimately rewarding but not uncomplicated installation. There are several desktop environments to choose from, an awesome package manager in YaST. Bonus points for its ease of set up on the Raspberry Pi. You can use the default OSMC skin with its modern feel, classic Kodi skin, or any third-party skins as well.

Plus, there are tons of ways to stream media from Kodi addons or local media. OSMC benefits from regular updates such as a bump to Linux 4. While similar to RetroPie with its EmulationStation frontend it has a similar lineup of gaming emulators. However, Recalbox is a bit more user-friendly and less customizable.

Newer users may prefer Recalbox, whereas seasoned Linux pros may be left wanting. In fact, it includes compatibility with the likes of Hyperion for creating a DIY Ambilight for your media center. Based on RetroArch, Lakka is an uber-powerful Linux-based retro gaming operating system.If you are looking for a piece of software that has both zealots for and against, ZFS should be at the top of your list.

Today we are seeing many storage systems predicated on flash storage but ZFS was born of a different era. That is an important piece of background information because with disk-based arrays performance is always a concern due to the slow media. We are then going to discuss what makes a good device and some common pitfalls to avoid when selecting a drive. As we have hinted at STH, we just did a bunch of benchmarking on current options so we will have some data for you in follow-up pieces.

slog(8) - Linux man page

We are going to try keeping this at a high enough level so that a broad audience can understand what is going on. If you want to help by coding new features for OpenZFS, this is not the ultra-technical guide you need. In the original draft of this article, we started with ZFS. Instead, we wanted to provide a bit of background as to what happens when you write data, at least at a high-level.

We are going to use a simple example of a client machine, say a virtual machine host, writing to a ZFS storage server. We are going to exclude all of the fun network stack bits, and impacts of technology like RDMA.

Remember, high-level. Let us say that you have a VM running on a VM host. That host needs to save data to its network storage so it can be accessed later by that VM or another VM host.

linux slog

We essentially have three major operations that need to happen. The transmission of the data from the client VM host. Once the data reaches the other side of the network at the storage server, that data needs to be received by the storage server.

Finally, the storage server needs to acknowledge that data has been received. Here is the illustration:. That acknowledge is an important step in the process.

Until the client receives the acknowledgment, it does not know that data has been successfully received and is safe on storage. That acknowledgment is important because it can have a dramatic impact on synchronous write performance.