ELK收集Tomcat日志的实现

来源：jb51　　时间：2022/7/19 11:03:06　　对本文有异议

01 Tomcat 安装与测试

1.1 安装 Tomcat

安装Tomcat的本体和相关官方测试demo，参考链接

apt-get install tomcat8 -y # 安装Tomcat本体
apt-get install tomcat8-docs tomcat8-examples tomcat8-admin -y # 安装测试demo

1.2 Tomcat 启动检查

systemctl start tomcat8 # 启动Tomcat
systemctl status tomcat8
netstat -lntup|grep 8080 # 端口测试
lsof -i:8080
# 端口检查得到输出
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
java    4502 tomcat8   63u  IPv6 125026      0t0  TCP *:http-alt (LISTEN)

1.3 查看 Tomcat 日志

启动tomcat之后，使用本地浏览器访问http://localhost:8080/访问tomcat页面，在页面中点击按钮产生HTTP请求，让tomcat产生日志

tail -f /var/log/tomcat8/localhost_access_log.2021-08-01.txt

02 修改 Tomcat 日志为 Json 格式

打开Tomcat的server.xml配置文件进行修改，在日志文件中的文末修改如下对应设置

# 编辑配置文件
vim /etc/tomcat8/server.xml
#将以下内容替换配置文件中135行对应内容
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log" suffix=".log"
               pattern="{&quot;client&quot;:&quot;%h&quot;,  &quot;client user&quot;:&quot;%l&quot;,   &quot;authenticated&quot;:&quot;%u&quot;,   &quot;access time&quot;:&quot;%t&quot;,     &quot;method&quot;:&quot;%r&quot;,   &quot;status&quot;:&quot;%s&quot;,  &quot;send bytes&quot;:&quot;%b&quot;,  &quot;Query?string&quot;:&quot;%q&quot;,  &quot;partner&quot;:&quot;%{Referer}i&quot;,  &quot;Agent version&quot;:&quot;%{User-Agent}i&quot;}"/>
# 查看修改内容
cat -n /etc/tomcat8/server.xml

重新启动tomcat并查看日志，检验是否配置成功，产生新的日志还是需要通过使用浏览器访问8080端口，在Tomcat的demo样例中对tomcat发送请求产生日志。

# 先清空日志
> /var/log/tomcat8/localhost_access_log.2021-08-02.txt 
# 重新启动Tomcat
systemctl restart tomcat8
# 查看日志
root@master:/var/log/tomcat8# tail -f /var/log/tomcat8/localhost_access_log.2021-08-02.log  # 查看日志命令
{"client":"172.16.255.1", "client user":"-", "authenticated":"-", "access time":"[02/Aug/2021:02:23:55 +0000]", "method":"GET /examples/servlets/images/return.gif HTTP/1.1", "status":"200",  "send bytes":"1231",  "Query?string":"", "partner":"http://172.16.255.131:8080/examples/servlets/", "Agent version":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"}
{"client":"172.16.255.1", "client user":"-", "authenticated":"-", "access time":"[02/Aug/2021:02:23:57 +0000]", "method":"GET /examples/servlets/servlet/RequestParamExample HTTP/1.1", "status":"200",  "send bytes":"673",  "Query?string":"", "partner":"http://172.16.255.131:8080/examples/servlets/", "Agent version":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"}
{"client":"172.16.255.1", "client user":"-", "authenticated":"-", "access time":"[02/Aug/2021:02:24:01 +0000]", "method":"GET /host-manager/html HTTP/1.1", "status":"401",  "send bytes":"2044",  "Query?string":"", "partner":"http://172.16.255.131:8080/", "Agent version":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"}

03 配置 Filebeat 采集 Tomcat 日志

新增Filebeat输入配置，将tomcat日志参照Nginx的Json格式日志采集方式配置如下

vim小技巧：将连续多行内容复制对应位置使用t命令，在Normal模式中输入:2,7t11表示将第二到第七行的内容复制到第十一行开头；将连续多行内容移动对应位置使用m命令，在Normal模式中输入:2,7m11表示将第二到第七行的内容移动到第十一行开头

vim小技巧：在输入内容时要使用到某个文件路径可以是用!命令然后使用shell命令查看内容，例如查看某个文件的路径可以在Normal模式中输入:!ls /var/log/tomcat8/...提示

# ================== Filebeat inputs ===============
# ------------------------------Tomcat----------------------------------
- type: log
  enabled: true
  paths:
    # - /var/log/tomcat8/localhost_access_log.2021-08-02.log
    # 为了能够采集所有日期的日志，将文件名中的指定日期改成通配符`*`
    - /var/log/tomcat8/localhost_access_log.*.log
  json.keys_under_root: true
  json.overwrite_keys: true
  tags: ["tomcat"]
 
# ================================== Outputs ===================================
# ---------------------------- Elasticsearch Output ----------------------------
output.elasticsearch:
  hosts: ["172.16.255.131:9200"]
  indices:
      - index: "nginx-access-%{[agent.version]}-%{+yyyy.MM}"
        when.contains:
            tags: "access"
      - index: "nginx-error-%{[agent.version]}-%{+yyyy.MM}"
        when.contains:
            tags: "error"
# 在输出配置中添加如下索引设置识别tomcat日志，值得注意的时这里不需要再重新编辑template设置，应该pattern配置只在第一次使用时进行匹配识别
      - index: "tomcat-access-%{[agent.version]}-%{+yyyy.MM}"
        when.contains:
            tags: "tomcat"