LogMonitor

LogMonitor is a Java Swing application for working with live logs over remote connections (SSH/FTP/SMB/etc.). It continuously tails logs and lets you quickly search and filter what you see while keeping an optional auto-scroll "follow tail" behavior.

What it can do

• Tail logs continuously from configured sources (for SSH it uses tail -n 3000 -f <path>)
• Pause/resume auto-follow while you scroll or search
• Search within the current log buffer and show match count
• Filter displayed content:
  • line filter (grep) via Ctrl + G / Ctrl + Shift + G
  • block filter via Ctrl + B / Ctrl + Shift + B (only when blockPattern is configured)
• Toggle line wrapping (W)
• Open a snapshot of the current log tab in a popup (P)
• Save a full remote file via the ... menu for each configured log
• Clear the visible buffer (C) and reload (F5)

Supported log sources

Configured in settings.xml via <server ... serverType="...">:

• SSH (default when serverType is omitted)
  • Tails using SSH
  • "Save full file" tries compression first:
    • zip (preferred if zip exists on the remote host)
    • otherwise gzip (if available)
• FTP (polls and downloads updated content)
• SMB (SMB v1; implemented via jcifs)
• SMBv2 (SMB v2; implemented via smbj)
• File (local file)
• SHUB (SocketHub client)
• Pega (Pega log source)

Keyboard shortcuts

Shortcuts are defined by the included res/Shortcuts.html and implemented primarily in ru.lanit.dibr.utils.gui.LogPanel.

• Search:
  • Ctrl + F: find text
  • F3: next match
  • Shift + F3: previous match
• Filtering:
  • Ctrl + G: show only lines containing text (grep filter)
  • Ctrl + Shift + G: hide lines containing text
  • Ctrl + B: show only blocks matching text/pattern (block filter; requires blockPattern)
  • Ctrl + Shift + B: hide blocks matching
• Other:
  • F1: open shortcuts window
  • ESC: close the current log window/popup
  • C: clear the visible log buffer
  • P: open a popup snapshot of the current log tab
  • F5: reload (and reset behavior depends on modifier)
  • Shift + F5: reset filters and reload
  • W: toggle line wrapping
  • Ctrl + S: search similar blocks (block-based)

Configuration (settings.xml)

Run the app from a folder that contains settings.xml (or pass a custom path as the first argument; default is settings.xml). If the file does not exist, the app creates a stub <settings> ... </settings> file.

Key sections:

• <theme>: colors and font
• <tunnel>: optional SSH tunneling definitions
• <server ...>: one or more servers/hosts
• <log ...>: one or more logs per server

Example settings.xml (trimmed):

<settings>
  <theme>
    <colors background="24110b" backgroundSelected="4d5f72" text="d6cbb0" textSelected="4af733"/>
    <font name="Courier New" style="0" size="12"/>
  </theme>

  <tunnel name="SSHTUN" host="123.123.123.123" user="guest" password="pass" port="22">
    <L localPort="30022" destHost="122.168.1.15" destPort="22" />
  </tunnel>

  <server name="SSH Server" host="example.com" user="andrew" port="22" password="123" encoding="utf-8">
    <log name="Log" file="/var/myLog.log"/>
  </server>

  <server serverType="FTP" name="simple FTP" host="example.com" port="21" user="anonymous" password="1">
    <log name="acces.log" file="/log/access.log"/>
    <log name="error.log" file="/log/error.log"/>
  </server>

  <server serverType="SMB" name="SMB" host="10.15.1.22" user="smbUser" password="smbPassword">
    <log name="log" file="Share/2016.02.12_03.17.12.756.log"/>
  </server>

  <server serverType="File" name="MyLocalLog">
    <log name="log" file="C:\\tmp\\latest.log"/>
  </server>
</settings>

If you want block-based filtering and block popups:

• set blockPattern on <log ... blockPattern="...">
• use Ctrl + B / Ctrl + Shift + B
• double-click inside the log content to open a popup with the matching block (XML formatting can be applied when enabled)

Build & run

Requirements:

• Java 8
• Gradle wrapper (gradlew / gradlew.bat)

Build:

# Windows (PowerShell)
.\gradlew.bat jar

# Linux/macOS
./gradlew jar

Run (example):

java -jar build/libs/LogMonitor-1.0-SNAPSHOT.jar settings.xml

Optional:

• -fontSize <number> (changes the UI font size)

The runnable jar is configured with Main-Class: ru.lanit.dibr.utils.Main (see build.gradle).