helper.sh
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Documentation

Documentation

Usage patterns, operational recommendations, and direct command examples for helper.sh scripts.

Publishing model

  • Each script has a human-readable landing page and a raw file URL.
  • Use raw URLs in terminal automation and page URLs for handoff or review.
  • Document operational assumptions next to the executable command.

Quick start

helper.sh publishes scripts as plain text files so they can be inspected, downloaded, or piped into bash depending on your operational policy.

curl -fsSL helper.sh/optimize_centos7_ssh.sh | sudo bash
curl -fsSL helper.sh/centos_disable_password_ssh.sh | sudo bash
curl -fsSL helper.sh/install_openvpn_client_centos7.sh | sudo bash
curl -fsSL helper.sh/tree-to-file.sh | sh
curl -fsSL -o switch-centos7-repo.sh helper.sh/switch-centos7-repo.sh && sudo bash switch-centos7-repo.sh
curl -fsSL helper.sh/install_openvpn_client_ubuntu.sh | sudo bash
curl -fsSL helper.sh/install_docker_ubuntu_2404.sh | sudo bash
curl -fsSL helper.sh/install_nginx_base_docker.sh | sudo bash
curl -fsSL helper.sh/install_mysql57_base_docker.sh | sudo bash
curl -fsSL helper.sh/install_redis705_base_docker.sh | sudo bash
curl -fsSL helper.sh/install_php72_base_docker.sh | sudo bash
curl -fsSL helper.sh/install_workerman3524_base_docker.sh | sudo bash
curl -fsSL helper.sh/hello.sh | bash
curl -fsSL helper.sh/docker-data-move.sh | sudo bash
curl -fsSL helper.sh/install_openvpn_server_centos.sh | sudo bash
curl -fsSL helper.sh/install_bleachwrt_docker_centos7.sh | sudo bash -s -- --yes

Per-script docs

Available usage guides

optimize_centos7_ssh.sh

A one-shot CentOS 7 SSH tuning script that disables reverse DNS lookup, turns off GSSAPI auth, pins IPv4, validates sshd_config, and restarts sshd safely.

Open guide

centos_disable_password_ssh.sh

A CentOS SSH hardening script that verifies an existing authorized_keys file, disables password login, keeps public key auth enabled, validates sshd_config, and reloads sshd safely.

Open guide

install_openvpn_client_centos7.sh

A helper.sh-hosted CentOS 7 OpenVPN client installer that imports the EPEL GPG key, installs OpenVPN, copies local client.conf and login.txt, deploys a DNS helper, and enables openvpn-client@client.

Open guide

tree-to-file.sh

A helper.sh-hosted directory tree exporter that writes the current project structure into tree.txt and falls back cleanly when tree is unavailable.

Open guide

switch-centos7-repo.sh

A CentOS 7 repository switch helper for replacing outdated or unreachable yum mirrors with usable sources.

Open guide

install_openvpn_client_ubuntu.sh

A helper.sh-hosted Ubuntu OpenVPN client installer that checks for local client.conf and login.txt, installs OpenVPN, optionally copies a local update-resolv-conf helper, and enables a systemd client service.

Open guide

install_docker_ubuntu_2404.sh

A one-shot installer for Docker Engine and Docker Compose on Ubuntu 24.04.4 LTS, published through helper.sh.

Open guide

install_nginx_base_docker.sh

A one-shot Docker installer for Nginx 1.22.1 that prepares /data/nginx, mounts host directories, and starts a reusable web service.

Open guide

install_mysql57_base_docker.sh

A Docker-based one-shot installer for MySQL 5.7 that prepares /data/mysql5.7 and starts a host-mounted database container.

Open guide

install_redis705_base_docker.sh

A Docker-based one-shot installer for Redis 7.0.5 that prepares /data/redis7.0.5 and starts a host-mounted cache container.

Open guide

install_php72_base_docker.sh

A Docker-based one-shot installer for PHP 7.2 that prepares /data/php7.2 and starts a host-mounted PHP-FPM container.

Open guide

install_workerman3524_base_docker.sh

A Docker-based one-shot installer for Workerman 3.5.24 that prepares /data/workerman3.5.24 and starts a simple host-mounted HTTP worker service.

Open guide

hello.sh

The original helper.sh script used to verify connectivity and establish the shell-first experience.

Open guide

docker-data-move.sh

An interactive helper that migrates Docker data-root onto a larger disk with path checks, backups, and verification.

Open guide

install_openvpn_server_centos.sh

A CentOS 7 OpenVPN server installer with username/password auth, CCD fixed-IP support, ovpn-check self-test, and built-in access to the 192.168.30.0/24 LAN behind the VPN server.

Open guide

install_bleachwrt_docker_centos7.sh

Install a BleachWrt/OpenWrt-compatible Docker container on CentOS 7 with macvlan networking and a host shim for lawful LAN use.

Open guide

Platform pages

Browse by system and host role

Start from platform pages when your search begins with an operating system, a host type, or a delivery baseline.

Platform pages

CentOS 7 scripts

Recovery-oriented scripts for legacy CentOS 7 hosts that still need package installs, storage cleanup, and controlled maintenance.

Open page

Platform pages

Ubuntu 24.04 scripts

Helper pages and install scripts for bringing a fresh Ubuntu 24.04 host into a stable operations baseline.

Open page

Platform pages

Docker host setup

Scripts that prepare the host layer before service containers are installed, including Docker engine setup and Docker data layout maintenance.

Open page

Platform pages

Docker service stack scripts

A grouped view of the helper.sh service installers for Nginx, MySQL, Redis, PHP, and Workerman running on top of Docker.

Open page

Topic pages

Browse grouped operational topics

Use topic pages when you want to navigate by scenario instead of by script filename.

Topic pages

CentOS 7 maintenance and recovery

Keep legacy CentOS 7 hosts installable and maintainable when yum repositories fail, mirrors expire, or Docker data needs to be moved off a crowded disk.

Open topic

Topic pages

Ubuntu 24.04 deployment basics

Install Docker, bootstrap common runtime services, and keep fresh Ubuntu 24.04 hosts ready for application rollout.

Open topic

Topic pages

Docker base services for application hosts

Use helper.sh scripts to standardize containerized Nginx, MySQL, Redis, PHP, and Workerman services on long-lived hosts.

Open topic

Topic pages

OpenVPN client access and DNS handling

Set up OpenVPN client access on Ubuntu and CentOS 7 hosts, keep login files in the expected place, and handle DNS switching safely when private domains depend on the tunnel.

Open topic

Topic pages

Legacy runtime services on Docker

Maintain older application stacks such as PHP 7.2 and Workerman on Docker while keeping deployment steps standardized enough for handoff and recovery.

Open topic

Problem pages

Jump straight to common questions

Use these pages when the user starts from a problem description, not from a script name.

Problem pages

Why is CentOS 7 SSH login so slow

The usual causes are reverse DNS lookup, GSSAPI auth negotiation, and sometimes IPv6 fallback. Disable those waits before doing deeper SSH troubleshooting.

Open page

Problem pages

Why can I not connect after disabling SSH password login on CentOS

The usual cause is disabling PasswordAuthentication before confirming that the target account already has a working authorized_keys file and a successful key-based login test.

Open page

Problem pages

When should I use hello.sh first

Use hello.sh as a low-risk connectivity and shell-delivery check before handing a host to larger installation scripts.

Open page

Problem pages

How to install Nginx with Docker

Bring up a baseline Nginx container with fixed host paths so config, logs, and web content stay predictable.

Open page

Problem pages

How to install Redis 7.0.5 with Docker

Deploy Redis 7.0.5 with a consistent mounted directory layout so data and config survive container replacement.

Open page

Problem pages

How to install PHP 7.2 with Docker

Package an old PHP 7.2 runtime into a repeatable container layout so legacy code can stay isolated from the host.

Open page

Problem pages

When should I switch CentOS 7 repositories

Switch repository definitions when old CentOS 7 mirrors fail, time out, or no longer return valid metadata.

Open page

Problem pages

How to export a directory tree to tree.txt on Linux

Use tree-to-file.sh when you need a reusable way to export the current directory structure and auto-install tree if the host is missing it.

Open page

Problem pages

How to fix CentOS 7 yum 404 errors

Restore package installation on old CentOS 7 hosts when the default repositories no longer work.

Open page

Problem pages

How to move Docker data-root on CentOS 7

Move Docker data away from a crowded root or home filesystem before the host runs out of disk.

Open page

Problem pages

How to install Docker on Ubuntu 24.04

Use a one-shot install flow that handles package cleanup, official repositories, and Docker Hub reachability checks.

Open page

Problem pages

Why OpenVPN update-resolv-conf is not working

Troubleshoot login files, CRLF script issues, and Ubuntu systemd-resolved behavior when private DNS is expected over OpenVPN.

Open page

Problem pages

How to install MySQL 5.7 with Docker

Run an older MySQL 5.7 version with predictable mounted directories and generated credentials on a modern Docker host.

Open page

Problem pages

How to run Workerman 3.5.24 in Docker

Build a stable Workerman 3.5.24 image with the old PHP 7.2 runtime, archived Debian sources, and foreground process management handled by Docker.

Open page