我可以使用 JVM SNMP 功能对读写访问做什么？

Question

我正在使用工具 described here.

对 Java 应用程序进行 SNMP 监控

ACL 模板有一个格式部分描述了 access 和 managers 选项的含义：

##############################################################
#               Format of the acl group
##############################################################
#
# communities: a list of SNMP community strings to which the
#              access control applies separated by commas.
#
# access: either "read-only" or "read-write".
#
# managers: a list of hosts to be granted the access rights.
#    Each can be expressed as any one of the following:
#    - hostname: hubble
#    - ip v4 and v6 addresses: 123.456.789.12 , fe80::a00:20ff:fe9b:ea82
#    - ip v4 and v6 netmask prefix notation: 123.456.789.0/24, 
#         fe80::a00:20ff:fe9b:ea82/64  
#      see RFC 2373 (http://www.ietf.org/rfc/rfc2373.txt)
#
# An example of two community groups for multiple hosts:
#    acl = {
#     {
#       communities = public, private
#       access = read-only
#       managers = hubble, snowbell, nanak
#     }
#     {
#       communities = jerry
#       access = read-write
#       managers = hubble, telescope
#     }
#    }

如果我授予经理 access = read-write 那个经理实际上可以在运行 JVM 中编写或更改什么？

写入权限是否允许管理器执行诸如触发 GC 或堆转储之类的操作？

Answer 1

对于 JVM SNMP 写访问，您无能为力，但是，可以调用 GC。

要查找 JVM 中可以通过 SNMP 修改的所有内容，您可以遍历属于 JDK built-in SNMP server 的所有 Jvm*Meta 类并查找 non-trivial SnmpValue setter:

    public SnmpValue set(SnmpValue x, long var, Object data)

这是 JDK 8u121 中所有可写 OID 的列表以及相应的 JMX 方法：

ClassLoadingMXBean.setVerbose (1.3.6.1.4.1.42.2.145.3.163.1.1.1.4)
MemoryMXBean.setVerbose (1.3.6.1.4.1.42.2.145.3.163.1.1.2.2)
MemoryMXBean.gc (1.3.6.1.4.1.42.2.145.3.163.1.1.2.3)
MemoryPoolMXBean.setCollectionUsageThreshold (1.3.6.1.4.1.42.2.145.3.163.1.1.2.110.1.131)
MemoryPoolMXBean.setUsageThreshold (1.3.6.1.4.1.42.2.145.3.163.1.1.2.110.1.110)
MemoryPoolMXBean.resetPeakUsage (1.3.6.1.4.1.42.2.145.3.163.1.1.2.110.1.5)
ThreadMXBean.setThreadContentionMonitoringEnabled (1.3.6.1.4.1.42.2.145.3.163.1.1.3.5)
ThreadMXBean.setThreadCpuTimeEnabled (1.3.6.1.4.1.42.2.145.3.163.1.1.3.6)
ThreadMXBean.resetPeakThreadCount (1.3.6.1.4.1.42.2.145.3.163.1.1.3.7)

我可以使用 JVM SNMP 功能对读写访问做什么？

What can I do with read-write access with the JVM SNMP feature?

java

jvm

snmp