Lê Minh Quân's questions

我想使用具有多个 kube-state-metrics 的 kubernetes(cluster-0) 来监控多个其他 kubernetes 集群(cluster-1,2,3,4)

在 (cluster-0) 中，我拆分为多个命名空间，如下所示：

namespace: monitor

(here I will run prometheus to scrape metrics from other kube-state-metrics pod)

namespaces: cluster-0
(here I will run kube-state-metrics pod to monitor cluster-0
....
namespaces: cluster-4
(here I will run kube-state-metrics pod to monitor cluster-4)
...

等等...

这里的问题是我将如何设置 prometheus 来自动抓取新的 kube-state-metrics，因为我将非常快速地扩展 kubernetes 集群，或者缩小它。以及如何区分它们之间的不同指标，比如有一个标题......

我尝试使用配置，但- targets: ['serviceIP:8080']在我的情况下仅定位单个并不是很好。

我正在使用 helm 在我的 kubernetes 集群上安装 vernemq

问题是它无法启动，我接受了 EULA

这是日志：

02:31:56.552 [error] CRASH REPORT Process <0.195.0> with 0 neighbours exited with reason: {{{badmatch,{error,{vmq_generic_msg_store,{bad_return,{{vmq_generic_msg_store_app,start,[normal,[]]},{'EXIT',{{badmatch,{error,{{undef,[{eleveldb,validate_options,[open,[{block_cache_threshold,33554432},{block_restart_interval,16},{block_size_steps,16},{compression,true},{create_if_missing,true},{data,[{dir,"./data"}]},{data_root,"./data/leveldb"},{delete_threshold,1000},{eleveldb_threads,71},{fadvise_willneed,false},{limited_developer_mem,false},{sst_block_size,4096},{store_dir,"./data..."},...]],...},...]},...}}},...}}}}}}},...},...} in application_master:init/4 line 138
02:31:56.552 [info] Application vmq_server exited with reason: {{{badmatch,{error,{vmq_generic_msg_store,{bad_return,{{vmq_generic_msg_store_app,start,[normal,[]]},{'EXIT',{{badmatch,{error,{{undef,[{eleveldb,validate_options,[open,[{block_cache_threshold,33554432},{block_restart_interval,16},{block_size_steps,16},{compression,true},{create_if_missing,true},{data,[{dir,"./data"}]},{data_root,"./data/leveldb"},{delete_threshold,1000},{eleveldb_threads,71},{fadvise_willneed,false},{limited_developer_mem,false},{sst_block_size,4096},{store_dir,"./data..."},...]],...},...]},...}}},...}}}}}}},...},...}
Kernel pid terminated (application_controller) ({application_start_failure,vmq_server,{bad_return,{{vmq_server_app,start,[normal,[]]},{'EXIT',{{{badmatch,{error,{vmq_generic_msg_store,{bad_return,{{vm

{"Kernel pid terminated",application_controller,"{application_start_failure,vmq_server,{bad_return,{{vmq_server_app,start,[normal,[]]},{'EXIT',{{{badmatch,{error,{vmq_generic_msg_store,{bad_return,{{vmq_generic_msg_store_app,start,[normal,[]]},{'EXIT',{{badmatch,{error,{{undef,[{eleveldb,validate_options,[open,[{block_cache_threshold,33554432},{block_restart_interval,16},{block_size_steps,16},{compression,true},{create_if_missing,true},{data,[{dir,\"./data\"}]},{data_root,\"./data/leveldb\"},{delete_threshold,1000},{eleveldb_threads,71},{fadvise_willneed,false},{limited_developer_mem,false},{sst_block_size,4096},{store_dir,\"./data/msgstore\"},{sync,false},{tiered_slow_level,0},{total_leveldb_mem_percent,70},{use_bloomfilter,true},{verify_checksums,true},{verify_compaction,true},{write_buffer_size,41777529},{write_buffer_size_max,62914560},{write_buffer_size_min,31457280}]],[]},{vmq_storage_engine_leveldb,init_state,2,[{file,\"/opt/vernemq/apps/vmq_generic_msg_store/src/engines/vmq_storage_engine_leveldb.erl\"},{line,99}]},{vmq_storage_engine_leveldb,open,2,[{file,\"/opt/vernemq/apps/vmq_generic_msg_store/src/engines/vmq_storage_engine_leveldb.erl\"},{line,39}]},{vmq_generic_msg_store,init,1,[{file,\"/opt/vernemq/apps/vmq_generic_msg_store/src/vmq_generic_msg_store.erl\"},{line,181}]},{gen_server,init_it,2,[{file,\"gen_server.erl\"},{line,374}]},{gen_server,init_it,6,[{file,\"gen_server.erl\"},{line,342}]},{proc_lib,init_p_do_apply,3,[{file,\"proc_lib.erl\"},{line,249}]}]},{child,undefined,{vmq_generic_msg_store_bucket,1},{vmq_generic_msg_store,start_link,[1]},permanent,5000,worker,[vmq_generic_msg_store]}}}},[{vmq_generic_msg_store_sup,'-start_link/0-lc$^0/1-0-',2,[{file,\"/opt/vernemq/apps/vmq_generic_msg_store/src/vmq_generic_msg_store_sup.erl\"},{line,40}]},{vmq_generic_msg_store_sup,start_link,0,[{file,\"/opt/vernemq/apps/vmq_generic_msg_store/src/vmq_generic_msg_store_sup.erl\"},{line,42}]},{application_master,start_it_old,4,[{file,\"application_master.erl\"},{line,277}]}]}}}}}}},[{vmq_plugin_mgr,start_plugin,1,[{file,\"/opt/vernemq/apps/vmq_plugin/src/vmq_plugin_mgr.erl\"},{line,524}]},{vmq_plugin_mgr,start_plugins,1,[{file,\"/opt/vernemq/apps/vmq_plugin/src/vmq_plugin_mgr.erl\"},{line,503}]},{vmq_plugin_mgr,check_updated_plugins,2,[{file,\"/opt/vernemq/apps/vmq_plugin/src/vmq_plugin_mgr.erl\"},{line,444}]},{vmq_plugin_mgr,handle_plugin_call,2,[{file,\"/opt/vernemq/apps/vmq_plugin/src/vmq_plugin_mgr.erl\"},{line,246}]},{gen_server,try_handle_call,4,[{file,\"gen_server.erl\"},{line,661}]},{gen_server,handle_msg,6,[{file,\"gen_server.erl\"},{line,690}]},{proc_lib,init_p_do_apply,3,[{file,\"proc_lib.erl\"},{line,249}]}]},{gen_server,call,[vmq_plugin_mgr,{enable_system_plugin,vmq_generic_msg_store,[internal]},infinity]}}}}}}"}
Crash dump is being written to: /erl_crash.dump...

所以我的问题在哪里，我只是helm install vernemq vernemq/vernemq用来安装它。

我的场景是：我是 Windows Server 2012 R2 的管理员。我创建了 2 个组：“学生”和“老师”，“学生”只能访问“学生”文件夹，而老师只能访问“老师”文件夹。

每组还有 2 台打印机 1。他们只能使用他们的打印机，其他人不能。

那么“学生”组中的学生是否可以从“老师”打印机打印（学生无权访问管理员角色）？

ceph有高可用性吗，我这样配置2个节点

  cluster:

    id:     07df97db-f315-4c78-9d2a-ab85007a1856
    health: HEALTH_WARN
            Reduced data availability: 32 pgs inactive
            Degraded data redundancy: 374/590 objects degraded (63.390%), 18 pgs degraded, 32 pgs undersized

  services:
    mon: 2 daemons, quorum ceph1,ceph2
    mgr: ceph1(active), standbys: ceph2
    mds: mycephfs-1/1/1 up  {0=ceph1=up:active}, 1 up:standby
    osd: 2 osds: 1 up, 1 in

  data:
    pools:   6 pools, 96 pgs
    objects: 216  objects, 12 MiB
    usage:   75 MiB used, 945 MiB / 1020 MiB avail
    pgs:     33.333% pgs not active
             374/590 objects degraded (63.390%)
             64 active+clean
             18 undersized+degraded+peered
             14 undersized+peered

如您所见，我设置了 2 个 mon 调用 ceph1 和 ceph2，但是当我停止 ceph1 时，ceph2 无法将文件写入 VM 上的 cephfs 挂载存储

那么如何让ceph高可用呢？是否需要更多节点或类似的东西？

我读过这篇文章：https ://tracker.ceph.com/projects/ceph/wiki/Benchmark_Ceph_Cluster_Performance

但问题是他们对 4MB 文件进行基准测试，而我需要对 1000 个 5kb 文件进行基准测试

有没有办法做到这一点，比如dd if=/dev/null of={location} bs = {size} count = {numberoffile} oflag=dsync

我在学校有一个关于标题问题的练习，我用谷歌搜索了几个小时，但没有发现任何有用的东西。

我只知道，说到HA，GlusterFS相比NFS消除了单点故障

还有什么可以比较的，比如 I/O ....