前言

透过Zabbix文件系统监控告警发现日志未定时清理，进一步排查后确认前同事写的trimlog脚本在某些服务器上执行定时任务时出现了异常，review后发现代码逻辑本身没有问题，主要由于cron job在执行date参数时没有使用转义字符导致，不过trimlog.sh这个日志清理脚本代码结构清晰易读，做下共享方便大家参考和二次修改。

基于bash shell脚本制定灵活的trimlog日志清理策略

更新历史

2019年10月08日 - 初稿

阅读原文 - https://wsgzao.github.io/post...

扩展阅读

基于bash find命令执行log日志备份和清理的一次简单实践

问题描述

# 检查crontabcat /etc/crontab#Ansible: gdp_trim_log0 1 * * * root /data/release/trimlog.sh '/data/release/log/gop_gdp' 30 1 '*' '%Y%m%d' >> /data/release/trimlog.txt0 1 * * * root /data/release/trimlog.sh '/data/release/log/cacheupdate' 30 1 '*' '%Y%m%d' >> /data/release/trimlog.txt#Ansible: gdp_trim_backup0 1 * * * root /data/release/trimbackup.sh '/data/release/backup/gop_gdp' 30 >> /data/release/trimbackup.txt# 检查crontab日志less /var/log/cronOct  8 01:00:01 sg-gop-10-71-12-146 CROND[183782]: (root) CMD (/data/release/trimlog.sh '/data/release/log/gop_gdp' 30 1 '*' ')Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183783]: (root) CMD (/data/release/trimbackup.sh '/data/release/backup/gop_gdp' 30 >> /data/release/trimbackup.txt)Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183784]: (root) CMD (/data/release/trimlog.sh '/data/release/log/cacheupdate' 30 1 '*' ')Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183786]: (root) CMD (/usr/lib64/sa/sa1 1 1)Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183788]: (root) CMD (cd /tmp &&  ss -tna | awk '{print $1}' | sort | uniq -c > snmpss.tmp && chcon system_u:object_r:snmpd_var_run_t:s0 snmpss.tmp && mv -f snmpss.tmp snmpss.cache)Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183779]: (root) CMDOUT (/bin/bash: -c: line 0: unexpected EOF while looking for matching `'')Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183779]: (root) CMDOUT (/bin/bash: -c: line 1: syntax error: unexpected end of file)Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183778]: (root) CMDOUT (/bin/bash: -c: line 0: unexpected EOF while looking for matching `'')Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183778]: (root) CMDOUT (/bin/bash: -c: line 1: syntax error: unexpected end of file)Oct  8 01:00:01 sg-gop-10-71-12-146 CROND[183777]: (root) CMDOUT (find: ‘/data/release/backup/gop_gdp’: No such file or directory)# 在crontab的date中加入转移字符即可0 1 * * * root /data/release/trimlog.sh '/data/release/log/gop_gdp' 30 1 '*' '\%Y\%m\%d' >> /data/release/trimlog.txt0 1 * * * root /data/release/trimlog.sh '/data/release/log/cacheupdate' 30 1 '*' '\%Y\%m\%d' >> /data/release/trimlog.txt

bash shell代码

vim /data/release/trimlog.sh
#!/bin/bashdir=`dirname $0`if [ $# -lt 1 ]then    echo "usage: $0 DIRECTORY [DELETE_DAYS] [COMPRESS_DAYS] [COMPRESS_FILE_PATTERN] [DATE_PATTERN]"    echo "multiple matches example for COMPRESS_FILE_PATTERN: data|error"    exitficurrent_date=$(date +"%Y-%m-%d %T")echo "Start trim log at $current_date "path=$1if [ $# -gt 1 ]then    log_delete_days=$2else    log_delete_days=7fiif [ $# -gt 2 ]then    log_compress_days=$3else    log_compress_days=0fiif [ $# -gt 3 ]then    log_compress_match=$4else    log_compress_match='*'fiif [ $# -gt 4 ]then    date_pattern=$5else    date_pattern="%Y-%m-%d"fiif [ $log_delete_days -gt 0 ]then    files=`ls $path/*.log.*`    i=0    while [ $i -le $log_delete_days ]    do        d=`date "+$date_pattern" --date "$i day ago"`        files=`echo "$files"|grep -v $d`        i=`expr $i + 1`    done    echo "$files"|xargs rm -ffiif [ $log_compress_days -gt 0 ] && [ -n "$log_compress_match" ]then    files=`ls $path/*.log.*|grep -v "\.gz$"|grep -E "$log_compress_match"`    i=0    while [ $i -lt $log_compress_days ]    do        d=`date "+$date_pattern" --date "$i day ago"`        files=`echo "$files"|grep -v $d`        i=`expr $i + 1`    done    echo "$files"|xargs gzipficurrent_date=$(date +"%Y-%m-%d %T")echo "Finish trim log at $current_date "
vim /data/release/trimbackup.sh
#!/bin/bashdir=`dirname $0`if [ $# -lt 1 ]then    echo "usage: $0 DIRECTORY [KEEP_BACKUP_NUM]"    exitficurrent_date=$(date +"%Y-%m-%d %T")echo "Start trim backup at $current_date "path=$1if [ $# -gt 1 ]then    keep_backup_num=$2else    keep_backup_num=10fii=0find $path -maxdepth 1 ! -path $path -type d -printf '%p\n' | sort -r -n | while read dir; do    i=`expr $i + 1`    if [ $i -gt $keep_backup_num ]    then        echo "del $dir"        rm -rf $dir    else        echo "keep $dir"    fidonecurrent_date=$(date +"%Y-%m-%d %T")echo "Finish trim backup at $current_date "