Created
December 8, 2025 02:58
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A crontab script to test and keep tcp tunnel alive.
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| #!/bin/bash | |
| TARGET_LIST=( | |
| "127.0.0.1 22001" | |
| "127.0.0.1 22002" | |
| "127.0.0.1 22003" | |
| ) | |
| LOG_FILE=~/log/tcp_keep_alive.log | |
| TIMEOUT_BIN=/usr/bin/timeout | |
| NC_BIN=/usr/bin/nc | |
| TIMEOUT_NC="1" | |
| TIMEOUT_CMD="5" | |
| mkdir -p ~/log | |
| for TARGET_ENTRY in "${TARGET_LIST[@]}"; do | |
| if ! $TIMEOUT_BIN $TIMEOUT_CMD $NC_BIN -z -w $TIMEOUT_NC $TARGET_ENTRY 2>&1 > /dev/null; then | |
| echo "$(date "+%Y-%m-%d %H:%M:%S") [Error]：fail to connect to $TARGET_ENTRY" >> $LOG_FILE | |
| fi | |
| done |
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