ClamAV安装使用教程
环境：Centos 7.9/ClamAV0.104.1
1、ClamAV介绍
ClamAV（Clam AntiVirus）是Linux平台上的开源病毒扫描程序，主要应用于邮件服务器，采用多线程后台操作，可以自动升级病毒库。
2、安装epel软件源
#安装
yum install -y epel-release
#缓存
yum clean all && yum makecache
3、安装依赖环境
yum install -y openssl openssl-devel libcurl-devel zlib-devel libpng-devel libxml2-devel json-c-devel bzip2-devel pcre2-devel ncurses-devel
4、下载软件安装包
ClamAV官方下载地址：http://www.clamav.net/downloads
5、创建clamav用户和存放病毒库目录
groupadd clamav && useradd -g clamav clamav && id clamav
mkdir -p /usr/local/clamav/logs
touch /usr/local/clamav/logs/clamd.log
touch /usr/local/clamav/logs/freshclam.log
chown clamav:clamav /usr/local/calmav/logs/clamd.log
chown clamav:clamav /usr/local/clamav/logs/freshclam.log
mkdir -p /usr/local/clamav/updata
chown -R root:clamav /usr/local/clamav/
chown -R clamav:clamav /usr/local/clamav/updata/
6、解压软件安装包
tar xf clamav-0.104.1.tar.gz
7、编译安装
cd clamav-0.104.1/
./configure --prefix=/usr/local/clamav --disable-clamav --with-pcre
make && make install
echo $?
8、配置ClamAV
cd /usr/local/clamav/etc
cp clamd.conf.sample clamd.conf
cp freshclam.conf.sample freshclam.conf
vim clamd.conf
#Example 注释掉这一行.
添加下面三行：
LogFile /usr/local/clamav/logs/clamd.log
PidFile /usr/local/clamav/updata/clamd.pid
DatabaseDirectory /usr/local/clamav/updata
vim freshclam.conf
#Example 注释掉这一行.
添加下面三行
DatabaseDirectory /usr/local/clamav/updata
UpdateLogFile /usr/local/clamav/logs/freshclam.log
PidFile /usr/local/clamav/updata/freshclam.pid
9、启动ClamAV
chown -R clamav.clamav /usr/local/clamav/
systemctl start clamav-freshclam.service
systemctl enable clamav-freshclam.service
systemctl status clamav-freshclam.service
10、跟新病毒库
#先停止freshclam
systemctl stop clamav-freshclam.service
#再更新
/usr/local/clamav/bin/freshclam （根据网络质量确定更新时长）
#或者
cd /usr/local/clamav/share/clamav
wget http://database.clamav.net/main.cvd
wget http://database.clamav.net/daily.cvd
wget http://database.clamav.net/bytecode.cvd
#更新完成启动
systemctl start clamav-freshclam.service
systemctl status clamav-freshclam.service
11、创建软链接
ln -s /usr/local/clamav/bin/clamscan /usr/local/sbin/clamscan
#说明：如果在手动更新病毒库的时候遇到错误，此时就要删除掉旧的镜像地址文件
#rm -f /var/lib/clamav/mirrors.dat，再手动更新一次病毒库。
12、扫描病毒
clamscan /
扫描参数：
-r/--recursive[=yes/no] 所有文件
--log=FILE/-l FILE 增加扫描报告
--move [路径] 移动病毒文件至..
--remove [路径] 删除病毒文件
--quiet 只输出错误消息
--infected/-i 只输出感染文件
--suppress-ok-results/-o 跳过扫描OK的文件
--bell 扫描到病毒文件发出警报声音
--unzip(unrar) 解压压缩文件扫描
13、定时扫描
#让服务器每天晚上定时更新和杀毒，保存杀毒日志，crontab文件如下：
1 3 * * * /usr/local/clamav/bin/freshclam --quiet
20 3 * * * /usr/local/clamav/bin/clamscan -r /home --remove -l /var/log/clamscan.log
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