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Troubleshooting

How can I monitor memory usage of my Tomcat/JVM?

VM Host custom Java Control Panel offers graphing of basic JVM parameters. You need to enable 'monitor' attribute in your JCP and wait a 5 minutes before graphs fill with data. On `'tats' page you can select different graphing periods. See example graph below. To closer

Roundcube Mailbox doesn't exist: Trash

Have a look in /var/lib/roundcube/config/defaults.inc.php (in Ubuntu 16.04.1) if the following lines exist and are correct ——————————————————————————————————— // store draft message is this mailbox // leave blank if draft messages should not be stored // NOTE: Use folder names with namespace prefix (INBOX. on Courier-IMAP) $config[

Apache warns that my self-signed certificate is a CA certificate

Question As I don't know the openssl command's arguments by heart, I am used to referring to the same SO answer whenever I need to create self-signed certificates (for testing environments). The command looks like: openssl req -x509 -nodes -newkey rsa:2048 -keyout mysite.key -out

查看 Linux TCP Port 被哪隻程式(Process)佔用

查看 Linux TCP Port 被哪隻程式(Process)佔用, 可以用下述的命令: * sudo lsof -i * sudo lsof -i | grep TCP * sudo lsof -i :80 | grep LISTEN * sudo netstat -lptu * sudo netstat -tulpn * sudo ls -l /proc/$pid/exe 列出此 TCP Port 目前有哪些 PID * sudo fuser 80/tcp # 會把目前使用此 Port 的 PID 全部列出

Steps to remove NetBackup Media Server Deduplication Pool (MSDP) configuration from a NetBackup environment

Problem Steps to remove NetBackup Media Server Deduplication Pool (MSDP) configuration from a NetBackup environment Solution Warning: These steps will expire all images associated with the MSDP that is to be removed! Note: For NetBackup version 7.0.1, the script in step 13 is only available with the latest

觀察DNS，TCPIP，FQDN，Domain，Port，開啟的應用程式網路工具介紹

觀察DNS，TCPIP，FQDN，Domain，Port，開啟的應用程式網路工具介紹介紹四個工具 DNSQuerySniffer SmartSniff TCPLogView TCPView 電腦網路觀察封包的活動當然如果你會 Wireshark 或是 Microsoft Network Monitor 那更好但是通常 iT/MIS 不需要用到這麼細的工具只要可以觀察那些應用程式開啟了那些 Remote Port Remote IP Domain FQDN 封包的種類大概就夠了因此這四個工具也夠用了相關下載位置請自行Google 當然學會怎麼看和學會怎麼使用那就請好好Google學習了門神JanusLin

How to troubleshoot frozen media on UNIX and Windows

Problem DOCUMENTATION: How to troubleshoot frozen media on UNIX and Windows Solution Modification: When troubleshooting frozen media issues, it is important to understand the following: * Media must be unfrozen one at a time. * A media being frozen does not necessarily mean that the media in question is defective. Freezing media