Learn how to troubleshoot the “Communications link failure” error in Java/MySQL applications, typically thrown as CommunicationsException.
Baeldung Author
Hiks Gerganov
Driven by self-improvement and self-sufficiency. Self-motivated and self-disciplined. Dependable. Minimalist perfectionist. Problem solver. Can work on and improve anything related to IT.
Here's what I've written (so far):
Baeldung on Java
- All
- Persistence (2)
- Security (1)
- Java IO (1)
- Java (1)
- IDE (1)
Performing Export and Backup of H2 Databases
Filed under Persistence
Learn to create reliable backups of H2 databses and export data for recovery, inspection, or reuse.
Rename Existing Field With Elasticsearch Mapping
Filed under Java
Learn how renaming fields in Elasticsearch usually requires recreating an index reindexing.
How to Manage the java.io.IOException: Invalid Keystore Format Error
Learn how to resolve the java.io.IOException: Invalid Keystore format error in Java by identifying its causes and applying the correct fixes for keystore configuration.
Visual Studio Code File and Cache Handling
Filed under IDE
Explore caching in VSCode, how it works with files, ways to clear some caches inside the editor, and how different operations affect them.
Baeldung on Linux
- All
- Administration (75)
- Scripting (39)
- Processes (36)
- Security (30)
- Filesystems (28)
- Networking (20)
- Files (19)
- File Editing (15)
- Network Configuration (11)
- Installation (11)
- User Administration (8)
- File Permissions (8)
- Web (7)
- Text Processing (6)
- Package Management (6)
- File Viewing (5)
- Boot Process (5)
- File Compression (4)
- File Transfer (3)
- File Searching (3)
- Service Management (2)
- Network Monitoring (1)
- File Conversion (1)
- Building (1)
Resolving the Reverse Tunnel Remote port forwarding failed for listen port SSH Error
Filed under Network Configuration, Security
Learn about reverse SSH tunnels, i.e., SSH port forwarding, and issues that you might encounter when trying to use them.
Intel and AMD Microcode and Properly Updating Microcode in Linux
Filed under Administration, Installation
Learn about processor microcode and see how to check and update it in Linux for two major processor manufacturers.
How to Disable Fast (Quick) Boot When BIOS and UEFI Are Inaccessible
Filed under Boot Process
Learn about a firmware option that enables faster booting for some operating systems but might prevent us from getting into the BIOS or UEFI setup.
SMB mount Security Modes and Fixing mount error(13): Permission denied in Linux
Filed under Filesystems, Networking
Explore the mount command, its security modes related to the SMB protocol, an unexpected error that mismatches can produce, and the implications of different settings.
What Are the rcuos or rcuob Processes Seen in the Output of top?
Filed under Administration, Processes
Learn about the kernel read-copy-update (RCU) mechanism, its historical implementation, and current guiding principles.
How to XOR Streams and File Content Using a Key in the Shell
Explore the XOR binary operation with several implementations for weak data encryption via XOR and a key.
tmux Session Logging and Pane Content Extraction
Filed under Administration
Explore ways to extract data from tmux panes manually and automatically.
tmux Copy and Paste Methods With and Without the Mouse
Filed under Administration
Learn about tmux and ways to copy and paste session contents with the keyboard and mouse.
The Samba Protocol and Secure Mounting With Credentials
Filed under Filesystems, Security
Explore Samba implementation of the SMB protocol along with many options to mount Samba shares.
Baeldung on Ops
- All
- Git (22)
- Kubernetes (13)
- Docker (7)
- Jenkins (2)
- DevOps (1)
- Deployment Tools (1)
Docker Build and Run Platforms and Resolving exec /usr/bin/sh: exec format error
Filed under Docker
Explore Docker build and run platforms, along with errors that they might lead to. Further, learn about alternative reasons for exec format error issues.
Dockerfile Mounts and Fixing Error Unknown Flag: ‘mount’
Filed under Docker
Learn what a Dockerfile is, how it evolved, and ways to use special mount types.
Get Kubernetes Pod and Container IP Address From Within a Container
Filed under Kubernetes
Learn about checking the pod and container IP addresses in a Kubernetes environment.
Pod Redundancy in Kubernetes or Why Deleted Pods Get Recreated
Filed under Kubernetes
Learn about redundancy at the pod level in Kubernetes and find out why pods might get recreated even after manual deletion.
Docker Container Initialization and Script Process Replacement With exec
Filed under Docker
Learn about Docker container initialization scripts and ways to optimize them via exec.
Docker Context and the Minikube docker-env Command
Filed under Docker
Explore ways to deploy Kubernetes with Minikube and how they relate to the Docker installation outside the deployment.
Kubernetes Node Storage Allocation
Filed under Kubernetes
Learn about Kubernetes node storage allocation and discovery.
Git References Hierarchy and Branches With Slashes
Filed under Git
Learn about Git branches and references and their hierarchy along with ways to expand it.
Git (Ref) Log Exploration and Branch Selection
Filed under Git
Learn ways to explore logs and commit data for one or more branches.