Auto-update Nginx Brotli dynamic modules after apt upgrade on Ubuntu & CentOS https://devopsan.com/how-to-install-auto-upgrade-nginx-brotli-module-on-ubuntu/

100-nginx-post-update

# Ubuntu & Debian
# Store this file as /etc/apt/apt.conf.d/100-nginx-post-update 
DPkg::Post-Invoke {"/usr/local/bin/ngx_brotli"; };

nginx_update.action

# CentOS & RHEL
# To enable the post-transaction hook on Yum installation-based (Centos, Fedora < 22, etc), 
# one has to install `yum-plugin-post-transaction-actions` package.
# Then add or create the following lines to /etc/yum/post-actions/nginx_update.action
nginx:update:bash /usr/local/bin/ngx_brotli
nginx:install:bash /usr/local/bin/ngx_brotli init

ngx_brotli

#!/bin/bash
# store this file as /usr/local/bin/ngx_brotli

ngx_brotli() {
    trap 'printf "Aborted by user. exiting...\n";exit' INT

    ngx_brotli_install() {

        local TEMP_DIR_INSTALL
        TEMP_DIR_INSTALL="$(mktemp -d -t ngx_brotli.XXXXXXXXXX)"
        printf "Temp dir: %s\n" "$TEMP_DIR_INSTALL"
        trap 'printf "Cleanup...\n Removing %s\n" "${TEMP_DIR_INSTALL}";rm -rf "${TEMP_DIR_INSTALL}";exit' EXIT

        local NGX_BROTLI_GIT_URL="https://github.com/google/ngx_brotli.git"
        local NGINX_VERSION
        local NGINX_LIB_LOCATION

        NGINX_VERSION=$(nginx -v 2>&1 | awk '{print $3}' | sed -e 's#/#-#g')
        NGINX_LIB_LOCATION=$(nginx -V 2>&1 | grep "modules-path" | sed -e 's#.*--modules-path=\(.[^ ]*\).*#\1#g')
        printf "Preparing brotli modules...\n"

        mkdir -p "${TEMP_DIR_INSTALL}/nginx"

        printf "Downloading nginx source code... (%s) \n" "${NGINX_VERSION}"
        curl -s -L "https://nginx.org/download/${NGINX_VERSION}.tar.gz" | tar -xzC "${TEMP_DIR_INSTALL}/nginx" --strip-components 1

        printf "Downloading brotli source code...\n"
        git clone "${NGX_BROTLI_GIT_URL}" "${TEMP_DIR_INSTALL}/ngx_brotli"
        cd "${TEMP_DIR_INSTALL}/ngx_brotli" && git submodule update --recursive --init

        printf "Compiling modules...\n"
        cd "${TEMP_DIR_INSTALL}/nginx" && ./configure --with-compat --add-dynamic-module=../ngx_brotli && make modules

        printf "Installing modules...\n"
        cp -vf "${TEMP_DIR_INSTALL}/nginx/objs/ngx_http_brotli"*.so "${NGINX_LIB_LOCATION}/"
    }

    local REQUIRED_PROGRAMS=("nginx" "git" "curl" "tar" "make")

    check_package() {
        command -v "${1}" >/dev/null 2>&1 || {
            printf >&2 "%s is required but not installed. Aborting.\n" "${1}"
            return 1
        }
    }

    for program in "${REQUIRED_PROGRAMS[@]}"; do
        check_package "${program}" || return 1
    done

    # Pass init argument if you want to install brotli modules for the first time.
    if [ "${1}" == "init" ]; then
        ngx_brotli_install && return 0
    fi

    if nginx -t 2>&1 | grep -q brotli; then
        printf "Upgrading ngx_brotli...\n"
        ngx_brotli_install && systemctl restart nginx.service
    else
        printf "ngx_brotli is already up to date.\n"
    fi
}

return 2>/dev/null || ngx_brotli "${@}"