How to check when a service was last restarted linux? (2023)

How to check when a service was last restarted linux?

journalctl --since=<date> --until=<another data> UNIT=<service name> SYSLOG_IDENTIFIER=systemd | awk ' /Started/{ started = 1 } /Stopped/{ if (started) { started = 0; restarted++; } } END { print "It was restarted " restarted "times." } ' The regex here are just an example.

Use who command to find last system reboot time/date

The pseudo user reboot logs in each time the system is rebooted. Thus last reboot command will show a log of all reboots since the log file was created.

Linux logs will display with the command cd/var/log. Then, you can type ls to see the logs stored under this directory. One of the most important logs to view is the syslog, which logs everything but auth-related messages.

You can further correlate the reboot you want to diagnose with system messages. For CentOS/RHEL systems, you'll find the logs at /var/log/messages while for Ubuntu/Debian systems, its logged at /var/log/syslog . You can simply use the tail command or your favorite text editor to filter out or find specific data.

Systemctl is a Linux command-line utility used to control and manage systemd and services. You can think of Systemctl as a control interface for Systemd init service, allowing you to communicate with systemd and perform operations. Systemctl is a successor of Init.

All you have to do is open Task Manager (can search start menu for Task Manager, right click the task bar and click on Task Manager, or search for taskmgr.exe) and open the Performance tab. Inside the CPU window, in the bottom left hand corner, you'll find the Up time.

How do I check service logs?

journalctl is a command for viewing logs collected by systemd. The systemd-journald service is responsible for systemd's log collection, and it retrieves messages from the kernel, systemd services, and other sources. These logs are gathered in a central location, which makes them easy to review.

Use journalctl to View Your System's Logs. journalctl may be used to query the contents of the systemd journal as written by systemd-journald. service . If called without parameters, it will show the full contents of the journal, starting with the oldest entry collected.

Linux System Logs

Linux has a special directory for storing logs called /var/log . This directory contains logs from the OS itself, services, and various applications running on the system.

Read dmesg Log File

Each time the system boots up, the messages from the kernel ring buffer are stored in the /var/log/dmesg file. The dmesg command shows the log file contents. If you have issues using the dmesg command, open the log file in a text editor to view the contents.

On Unix-like operating systems, the tail command reads a file, and outputs the last part of it (the "tail"). The tail command can also monitor data streams and open files, displaying new information as it is written. For example, it's a useful way to monitor the newest events in a system log in real time.

The easiest way to list services on Linux, when you are on a SystemV init system, is to use the “service” command followed by “–status-all” option. This way, you will be presented with a complete list of services on your system. As you can see, each service is listed preceded by symbols under brackets.

To check a service's status, use the systemctl status service-name command. I like systemd's status because of the detail given. For example, in the above listing, you see the full path to the unit file, the status, the start command, and the latest status changes.

The service command is used to run a System V init script. Usually all system V init scripts are stored in /etc/init. d directory and service command can be used to start, stop, and restart the daemons and other services under Linux.

The network statistics ( netstat ) command is a networking tool used for troubleshooting and configuration, that can also serve as a monitoring tool for connections over the network. Both incoming and outgoing connections, routing tables, port listening, and usage statistics are common uses for this command.

What is Systemctl reboot?

systemctl. To reboot your Linux system, simply type reboot or systemctl reboot : sudo systemctl reboot. The system will be restarted immediately. When the reboot is initiated, all logged-in users and processes are notified that the system is going down, and no further logins are allowed.

service operates on the files in /etc/init. d and was used in conjunction with the old init system. systemctl operates on the files in /lib/systemd. If there is a file for your service in /lib/systemd it will use that first and if not it will fall back to the file in /etc/init.

Uptime is a command that returns information about how long your system has been running together with the current time, number of users with running sessions, and the system load averages for the past 1, 5, and 15 minutes. It can also filter the information displayed at once depending on your specified options.

The lsof (list open files) command returns the user processes that are actively using a file system. It is sometimes helpful in determining why a file system remains in use and cannot be unmounted.

To find out, right-click the Taskbar and select Task Manager. When it comes up, select the performance tab. At the bottom of the screen, you will see the amount of uptime. In the example below, mine has been running for over six days and counting.

Service logs provide diagnostic information about the resources in your tenancy. When you enable logging on resources, you receive information about the resource in a log file. This information allows you to analyze, optimize, and troubleshoot your resources.

The journal is a component of systemd. It's a centralized location for all messages logged by different components in a systemd-enabled Linux system. This includes kernel and boot messages, messages coming from syslog, or different services.

Event logging provides a standard, centralized way for applications (and the operating system) to record important software and hardware events. The event logging service records events from various sources and stores them in a single collection called an event log.

How do I view Journalctl logs in Linux?

To look for log messages from a specific application, use the _COMM (command) modifier. If you also use the -f (follow) option, journalctl will track new messages from this application as they arrive. You can search for log entries using the process ID of the process that generated the log message.

RHEL 7 uses rsyslog to capture logs (and forward them as in OPs case). Journalctl provides another method of reading those logs.

systemd-journald is a system service that collects and stores logging data. It creates and maintains structured, indexed journals based on logging information that is received from a variety of sources: Kernel log messages, via kmsg. Simple system log messages, via the libc syslog(3) call.

Syslog is a protocol and utility for capturing and logging system information. This system information can be stored locally, remotely, or both. syslog allows a server to forward log messages over the network to SL1. SL1 then uses these messages to monitor the health of the server and trigger events (if necessary).

As noted by others, your syslog() output would be logged by the /var/log/syslog file. You can see system, user, and other logs at /var/log .

lsmod is a command-line utility that displays information about the loaded Linux kernel modules.

The log from the driver messages buffer can be used to diagnose issues with system drivers and why something isn't working. On Android, you can use the 'dmesg' output to get these logs. You'll need root access to get these logs though. Use the following ADB command to export the complete log.

What does uname mean in Linux?

uname is a command-line utility that prints basic information about the operating system name and system hardware.

wc (short for word count) is a command in Unix, Plan 9, Inferno, and Unix-like operating systems. The program reads either standard input or a list of computer files and generates one or more of the following statistics: newline count, word count, and byte count.