diff --git a/.update.sh b/.update.sh
index fb06ddd..2a207e0 100644
--- a/.update.sh
+++ b/.update.sh
@@ -12,7 +12,7 @@ cd $DOTFILES
 git fetch --all --prune
 if [[ -n "$(git status -s)" ]]; then
     fmt_error "directory not clean"
-    post_log "ERROR" "$THIS_FILE" "directory not clean"
+    post_beacon "dfs.dirty" 1>/dev/null &
     exit
 fi
 
@@ -25,6 +25,7 @@ case $DFS_UPDATE_CHANNEL in
 esac
 if [[ ${#DFS_COMMIT} != 40 ]]; then
     fmt_error "invalid commit id"
+    post_beacon "dfs.invalid-commit" 1>/dev/null &
     post_log "ERROR" "$THIS_FILE" "invalid commit id: ${DFS_COMMIT}"
     exit
 fi
@@ -32,11 +33,10 @@ fi
 # update
 if [[ "$(git rev-parse HEAD)" == "$DFS_COMMIT" ]]; then
     fmt_info "nothing to do"
-    post_log "INFO" "$THIS_FILE" "nothing to do"
 else
     fmt_info "checking out to commit $DFS_COMMIT ..."
     if [[ -z "$DFS_DEV" ]]; then
-        post_log "INFO" "$THIS_FILE" "will check out to commit $DFS_COMMIT"
+        post_beacon "dfs.updated" 1>/dev/null &
         git -c advice.detachedHead=false checkout $DFS_COMMIT
         cp ./.update.sh ./update.sh && chmod +x ./update.sh && exit $DFS_UPDATED_RET
     else
diff --git a/.zshrc2 b/.zshrc2
index 5af6eda..85a690a 100644
--- a/.zshrc2
+++ b/.zshrc2
@@ -169,6 +169,7 @@ dfs()
             echo 'Done. Please open a new shell to see the changes.'
             ;;
         log    ) "$DOTFILES/tools/common.sh" "post_log" "INFO" "dfs" "$2" ;;
+        beacon ) "$DOTFILES/tools/common.sh" "post_beacon" "$2" ;;
         *      ) echo "unknown command \"$1\". available: update, force-update, version, reset, cd, log" ;;
     esac
 }
diff --git a/install.sh b/install.sh
index 978600c..11a1e9a 100755
--- a/install.sh
+++ b/install.sh
@@ -34,50 +34,42 @@ install_dependencies()
             case $(get_linux_dist) in
                 "ubuntu"|"debian" )
                     $SUDO apt-get update
-                    $SUDO apt-get install -y git zsh bash tmux vim python3 python3-pip curl inetutils-ping cmake less bsdmainutils
+                    $SUDO apt-get install -y git zsh bash tmux vim curl inetutils-ping less bsdmainutils
                     ;;
                 "alpine" )
                     $SUDO apk update
-                    $SUDO apk add zsh bash git tmux vim curl python3 py3-pip fzf iputils coreutils util-linux
+                    $SUDO apk add zsh bash git tmux vim curl fzf iputils coreutils util-linux
                     ;;
                 * ) fmt_error "dfs auto-install is not implemented on linux distribution: $(get_linux_dist)"
             esac
             ;;
         "macos" )
             $SUDO brew update
-            $SUDO brew install git python3 zsh curl tmux vim util-linux
+            $SUDO brew install git zsh curl tmux vim util-linux
             ;;
         "msys" )
             pacman -Syu
-            pacman -S tmux git zsh bash curl vim python3 python3-pip
+            pacman -S tmux git zsh bash curl vim
             SUDO=""
             ;;
         * ) fmt_error "dfs auto-install is not implemented on OS: $(get_os_type)"
     esac
-
-    if [[ -x $(command -v pip3) ]]; then
-        $SUDO pip3 install requests
-    elif [[ -x $(command -v pip) ]]; then
-        $SUDO pip install requests
-    else
-        fmt_error "pip3 and pip not found. is pip correctly installed?"
-    fi
 }
 
 preinstall_check()
 {
     fmt_note "checking requirements ..."
-    local mandatory_commands=( "git" "zsh" "curl" )
-    local optional_commands=( "python3" "vim" "tmux" "ping" )
+    local mandatory_commands=( "git" "zsh" "curl" "grep" "cat" "cp" "bash" "mkdir" )
+    local optional_commands=( "vim" "tmux" "ping" )
     for i in "${mandatory_commands[@]}"; do
-        if [[ ! -x "$(command -v $i)" ]]; then
+        if ! command -v $i 1>/dev/null; then
             fmt_info "all this utils are required: ${mandatory_commands[@]}"
             fmt_info "install them manually or check scripts in tools/"
             fmt_fatal "\"$i\" not found. aborting ..."
         fi
     done
     for i in "${optional_commands[@]}"; do
-        if [[ ! -x "$(command -v $i)" ]]; then
+        if ! command -v $i 1>/dev/null; then
             fmt_warning "\"$i\" not found"
             ask_for_Yn "continue anyway?"
             if [[ "$?" == "0" ]]; then
@@ -219,8 +211,8 @@ install_update(){
     cp "${DOTFILES}/.update.sh" "${DOTFILES}/update.sh"
     chmod +x "${DOTFILES}/update.sh"
     fmt_note "running update.sh ..."
-    DFS_UPDATED_RET=1 ${DOTFILES}/update.sh
-    if [[ $? == 1 ]]; then
+    DFS_UPDATED_RET=85 ${DOTFILES}/update.sh
+    if [[ $? == 85 ]]; then
         fmt_note "dfs updated. re-running install.sh ..."
         "${DOTFILES}/install.sh" && exit
     fi
@@ -232,12 +224,13 @@ uninstall_update(){
 }
 
 install(){
-    install_update
     if [[ "$INSTALL_DEP" == "1" ]]; then install_dependencies; fi
+    install_update
     preinstall_check
     install_crontab
     install_file_content
     install_symlink
+    post_beacon "dfs.installed" 1>/dev/null &
     # those that won't be uninstalled in the future
     install_tmux_tpm
     install_vim_vundle
@@ -254,6 +247,7 @@ uninstall(){
     uninstall_crontab
     uninstall_file_content
     uninstall_symlink
+    post_beacon "dfs.uninstalled" 1>/dev/null &
     fmt_note "done uninstalling!"
 }
 
@@ -267,7 +261,8 @@ for i in ${PARSE_ARG_RET[@]}; do
         -d|--dev ) export DFS_DEV=1 ;;
         -l|--lite ) export DFS_LITE=1 ;;
         -a|--auto ) INSTALL_DEP=1 ;;
-        * ) fmt_fatal "unknown option \"$i\". available: -i, -r, -q, -d, -l, -a" ;;
+        -s|--secure ) export DFS_DEV=0 ;;
+        * ) fmt_fatal "unknown option \"$i\". available: -i, -r, -q, -d, -l, -a, -s" ;;
     esac
 done
 $FUNC
diff --git a/tools/common.sh b/tools/common.sh
index c376518..c192ab4 100755
--- a/tools/common.sh
+++ b/tools/common.sh
@@ -109,7 +109,7 @@ parse_arg()
     while [[ $# > 0 || -n "$ARG" ]]; do
         if [[ -z "$ARG" ]]; then ARG=$1; shift; fi
         case $ARG in
-            -q*|--quite ) DFS_QUIET=1 ;;
+            -q*|--quite ) export DFS_QUIET=1 ;;
             --* ) PARSE_ARG_RET+=("$ARG") ;;
             -* ) PARSE_ARG_RET+=("${ARG:0:2}") ;;
             *  ) PARSE_ARG_RET+=("$ARG") ;;
@@ -148,7 +148,12 @@ ask_for_Yn()
 
 post_log()
 {
-    python3 "${DOTFILES}/tools/log.py" "[$1] $2: $3"
+    "${DOTFILES}/tools/logger.sh" "log" "[$1][$2] $3"
+}
+
+post_beacon()
+{
+    "${DOTFILES}/tools/logger.sh" "beacon" "$1"
 }
 
 get_os_type() {
diff --git a/tools/log.py b/tools/log.py
deleted file mode 100644
index a2b5e7e..0000000
--- a/tools/log.py
+++ /dev/null
@@ -1,66 +0,0 @@
-#!/usr/bin/env python3
-import os, uuid, socket, argparse, logging
-
-namespace = uuid.UUID("cc23b903-1993-44eb-9c90-48bd841eeac3")
-logging.basicConfig(level=logging.INFO, format="[%(filename)s:%(lineno)d][%(levelname)s] %(message)s")
-
-try:
-    import requests
-except ImportError:
-    logging.critical("Please install requests module")
-    exit(1)
-
-
-def get_uuid_raw() -> str:
-    possible_uuid_files = [
-        "/var/lib/dbus/machine-id",
-        "/etc/machine-id",
-        os.path.join(os.path.expanduser('~'), ".config/dotfiles/uuid"),
-    ]
-    for i in possible_uuid_files:
-        if os.path.exists(i):
-            with open(i, "r") as f:
-                return f.read().strip()
-    if not os.path.exists(os.path.dirname(possible_uuid_files[-1])):
-        os.makedirs(os.path.dirname(possible_uuid_files[-1]))
-    with open(possible_uuid_files[-1], 'w') as f:
-        ans = str(uuid.uuid4())
-        f.write(ans)
-        return ans
-
-
-def get_uuid() -> str:
-    return str(uuid.uuid5(namespace, get_uuid_raw()))
-
-
-def post_log(url:str, hostname:str, uuid:str, content:str):
-    ans = requests.post(url, params={"hostname": hostname, "uuid": uuid}, data=content)
-    return ans
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser(description="post log to server")
-    parser.add_argument("-u", "--url", help="url to post to", default="https://api.beardic.cn/post-log")
-    parser.add_argument("content")
-    args = parser.parse_args()
-    url = args.url
-    content = args.content
-    hostname = socket.gethostname()
-    uuid = get_uuid()
-    content=content.strip()
-    if not content:
-        logging.error("empty log content")
-        exit(0)
-    resp = post_log(url, hostname, uuid, content)
-    if resp.status_code == 200:
-        logging.info("200 ok")
-        exit(0)
-    elif resp.status_code == 403:
-        logging.warning("403 forbidden")
-        logging.info("you may need to register your hostname and uuid")
-        logging.info(f"hostname: {hostname}, uuid: {uuid}")
-        exit(0)
-    else:
-        logging.critical("unknown error")
-        logging.error(f"{resp.status_code}: {resp.text}")
-        exit(1)
diff --git a/tools/logger.sh b/tools/logger.sh
new file mode 100755
index 0000000..f7bb8b5
--- /dev/null
+++ b/tools/logger.sh
@@ -0,0 +1,100 @@
+#!/bin/bash
+
+set -e
+THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
+source "$THIS_DIR/common.sh"
+
+if [[ -x $(command -v hostname) ]]; then
+    hostname=$(hostname)
+elif [[ -x $(command -v uname) ]]; then
+    hostname=$(uname -n)
+elif [[ -x $(command -v hostnamectl) ]]; then
+    hostname=$(hostnamectl --static)
+elif [[ -n "$HOSTNAME" ]]; then
+    hostname=$HOSTNAME
+elif [[ -f /proc/sys/kernel/hostname ]]; then
+    hostname=$(cat /proc/sys/kernel/hostname)
+elif [[ -f /etc/hostname ]]; then
+    hostname=$(cat /etc/hostname)
+else
+    fmt_fatal "unable to get hostname"
+fi
+
+init_uuid()
+{
+    local raw_uuid
+    if [[ -f /var/lib/dbus/machine-id ]]; then
+        raw_uuid=$(cat /var/lib/dbus/machine-id)
+    elif [[ -f /etc/machine-id ]]; then
+        raw_uuid=$(cat /etc/machine-id)
+    elif [[ -f ~/.config/dotfiles/uuid ]]; then
+        raw_uuid=$(cat ~/.config/dotfiles/uuid)
+    else
+        mkdir -p ~/.config/dotfiles
+        raw_uuid=$(uuidgen)
+        echo "$raw_uuid" > ~/.config/dotfiles/uuid
+    fi
+    uuid=$(uuidgen -n "cc23b903-1993-44eb-9c90-48bd841eeac3" -s -N "$raw_uuid")
+}
+
+post_beacon()
+{
+    local beacon_type=$1
+    if [[ -z "$beacon_type" ]]; then
+        fmt_fatal "beacon type is required"
+    fi
+    resp=$(curl -sSL -X POST "https://api.beardic.cn/post-beacon?hostname=$hostname&beacon=$beacon_type")
+    if grep -q "200" <<< "$resp"; then
+        echo $resp
+    else
+        echo $resp >&2
+        fmt_fatal "error posting beacon"
+    fi
+}
+
+post_log()
+{
+    local log_content=$1
+    if [[ -z "$log_content" ]]; then
+        fmt_fatal "log content is required"
+    fi
+    init_uuid
+    resp=$(curl -sSL -X POST -H "Content-Type: text/plain" -d "$1" "https://api.beardic.cn/post-log?hostname=$hostname&uuid=$uuid")
+    if grep -q "200" <<< "$resp"; then
+        echo $resp
+    elif grep -q "403" <<< "$resp"; then
+        echo $resp >&2
+        fmt_error "error posting log: authentification failed"
+        fmt_info "try to register you hostname and uuid"
+        fmt_info "hostname: $hostname"
+        fmt_info "uuid: $uuid"
+    else
+        echo $resp >&2
+        fmt_fatal "error posting log"
+    fi
+}
+
+print_help()
+{
+    fmt_info "usage: $0 <beacon|log> <beacon_type|log_content>"
+}
+
+if [[ $# != 2 ]]; then
+    print_help >&2
+    exit 1
+fi
+
+case "$1" in
+    -h|--help)
+        fmt_info "usage: $0 <beacon|log> <beacon_type|log_content>"
+        ;;
+    beacon)
+        post_beacon "$2"
+        ;;
+    log)
+        post_log "$2"
+        ;;
+    *)
+        fmt_fatal "invalid argument"
+        ;;
+esac
diff --git a/tools/test.zsh b/tools/test.zsh
index 634f07e..b6af5ec 100644
--- a/tools/test.zsh
+++ b/tools/test.zsh
@@ -17,6 +17,7 @@ grep -q ".zshrc2" ~/.zshrc
 # check scripts and functions
 dfs version
 dfs log 1
+dfs beacon github-ci
 z ~
 test ~ -ef "$(pwd)"
 dogo