Netplan, Systemd, SSH, Conda Cleanup

Netplan, Systemd, SSH, Conda Cleanup | Original

Home 2025.02

Trying Netplan
- Static IP configuration caused SSH loss
- Required physical access to revert
- Modified system’s DNS resolver file
Systemd Service
- Configure service for local LLM inference
- Set up web interface for LLM models
- Establish rule-based proxy tool service
- Use systemctl commands for service management
SSH Configuration
- Proxy external connections through corkscrew
- Exclude local network from proxy
- Manage SSH keys via keychain and agent
- Specify default private key location
Delete Conda in Linux
- Remove entire conda installation directory
- Delete conda initialization code from bashrc
- Update PATH environment variable
- Eliminate conda binaries from system path

Trying Netplan

I tried the configuration below to assign a static IP address to an Ubuntu machine. I run OpenWebUI and llama.cpp on that server.

network:
  version: 2
  ethernets:
    eth0:
      dhcp4: no
      addresses:
        - 192.168.1.128/32
      gateway4: 192.168.1.1

After running sudo netplan apply, the machine could no longer be accessed via ssh lzw@192.168.1.128.

The keyboard and mouse were used to log in to the machine, remove the files, and revert the settings.

/etc/resolv.conf was changed.

Systemd Service

2025.02.13

LLaMA Server Service Configuration

This section explains how to set up a systemd service for running the LLaMA server, which provides local LLM inference capabilities.

sudo emacs /etc/systemd/system/llama.service
sudo systemctl daemon-reload
sudo systemctl enable llama.service
journalctl -u llama.service

[Unit]
Description=Llama Script

[Service]
ExecStart=/home/lzw/Projects/llama.cpp/build/bin/llama-server -m /home/lzw/Projects/llama.cpp/models/DeepSeek-R1-Distill-Qwen-14B-Q5_K_M.gguf --port 8000  --ctx-size 2048 --batch-size 512 --n-gpu-layers 49 --threads 8 --parallel 1
WorkingDirectory=/home/lzw/Projects/llama.cpp
StandardOutput=append:/home/lzw/llama.log
StandardError=append:/home/lzw/llama.err
Restart=always
User=lzw

[Install]
WantedBy=default.target

Open WebUI Service Configuration

This section explains how to set up a systemd service for running Open WebUI, which provides a web interface for interacting with LLM models.

[Unit]
Description=Open Web UI Service

[Service]
ExecStart=/home/lzw/.local/bin/open-webui serve
WorkingDirectory=/home/lzw
StandardOutput=append:/home/lzw/open-webui.log
StandardError=append:/home/lzw/open-webui.err
Restart=always
User=lzw

[Install]
WantedBy=default.target

sudo systemctl enable openwebui.service
sudo systemctl daemon-reload
sudo systemctl start  openwebui.service

Clash Service Configuration

This section explains how to set up a systemd service for running Clash, a rule-based proxy tool.

[Unit]
Description=Clash Service

[Service]
ExecStart=/home/lzw/clash-linux-386-v1.17.0/clash-linux-386
WorkingDirectory=/home/lzw/clash-linux-386-v1.17.0
StandardOutput=append:/home/lzw/clash.log
StandardError=append:/home/lzw/clash.err
Restart=always
User=lzw

[Install]
WantedBy=default.target

# Create the service file
sudo emacs /etc/systemd/system/clash.service 

# Reload systemd daemon
sudo systemctl daemon-reload

# Enable and start the service
sudo systemctl enable clash.service
sudo systemctl start clash.service
sudo systemctl restart clash.service

# Check status
sudo systemctl status clash.service

SSH Configuration

2025.02.09

This ssh-config file configures SSH client behavior. Let’s break down each part:

Host * !192.*.*.*: This section applies to all hosts except those matching the 192.*.*.* pattern (typically, local network addresses).
- ProxyCommand corkscrew localhost 7890 %h %p: This is the key part. It tells SSH to use the corkscrew program to connect to the target host.
  - corkscrew: A tool that allows you to tunnel SSH connections through HTTP or HTTPS proxies.
  - localhost 7890: Specifies the proxy server’s address (localhost) and port (7890). This assumes you have a proxy server running on your local machine, listening on port 7890 (e.g., Shadowsocks, a SOCKS proxy, or another tunneling solution).
  - %h: A special SSH variable that expands to the target hostname you’re trying to connect to.
  - %p: Another SSH variable that expands to the target port (usually 22 for SSH).
- In summary, this Host block configures SSH to use the corkscrew proxy for all connections except those to the local network.
Host *: This section applies to all hosts.
- UseKeychain yes: On macOS, this tells SSH to store and retrieve SSH keys from your Keychain, so you don’t have to enter your password every time.
- AddKeysToAgent yes: This automatically adds your SSH keys to the SSH agent, so you don’t have to manually add them after each reboot.
- IdentityFile ~/.ssh/id_rsa: Specifies the path to your private SSH key file. ~/.ssh/id_rsa is the default location for the RSA private key.

In essence, this configuration sets up a proxy for all SSH connections except those on the local network, and it configures key management for convenience.

Host 192.168.1.*
    UseKeychain yes
    AddKeysToAgent yes
    IdentityFile ~/.ssh/id_rsa 
Host * !192.*.*.* !47.*.*.*
    ProxyCommand corkscrew localhost 7890 %h %p
Host *
    UseKeychain yes
    AddKeysToAgent yes
    IdentityFile ~/.ssh/id_rsa    

Delete Conda in Linux

2025.02.07

rm -rf ~/anaconda3

Delete below code in .bashrc:

# >>> conda initialize >>>
# !! Contents within this block are managed by 'conda init' !!
__conda_setup="$('/home/lzw/anaconda3/bin/conda' 'shell.bash' 'hook' 2> /dev/null)"
if [ $? -eq 0 ]; then
    eval "$__conda_setup"
else
    if [ -f "/home/lzw/anaconda3/etc/profile.d/conda.sh" ]; then
        . "/home/lzw/anaconda3/etc/profile.d/conda.sh"
    else
        export PATH="/home/lzw/anaconda3/bin:$PATH"
    fi
fi
unset __conda_setup
# <<< conda initialize <<<

Update path from:

export PATH="/usr/local/cuda-12.2/bin:/home/lzw/.local/share/gem/ruby/3.0.0/bin:/home/lzw/anaconda3/bin:/home/lzw/anaconda3/condabin:/home/lzw/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin"

To:

export PATH="/usr/local/cuda-12.2/bin:/home/lzw/.local/share/gem/ruby/3.0.0/bin:/home/lzw/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin"

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