systemctl status taosd 一直无法启动，网上各种找原因也没不行

1，删除data；

2，卸载重装 

3，修改日志目录

 vi /etc/taos/taos.cfg  

最后发现用最原始的命令会给出直接的错误

如本来是

● taosd.service - TDengine server service    Loaded: loaded (/etc/systemd/system/taosd.service; enabled; vendor preset: disabled)    Active: failed (Result: start-limit) since 四 2022-09-08 14:38:39 CST; 11s ago   Process: 9837 ExecStart=/usr/bin/taosd (code=exited, status=255)   Process: 9828 ExecStartPre=/usr/local/taos/bin/startPre.sh (code=exited, status=0/SUCCESS)  Main PID: 9837 (code=exited, status=255)

9月 08 14:38:39 localhost.localdomain systemd[1]: Unit taosd.service entered failed state. 9月 08 14:38:39 localhost.localdomain systemd[1]: taosd.service failed. 9月 08 14:38:39 localhost.localdomain systemd[1]: taosd.service holdoff time over, scheduling restart. 9月 08 14:38:39 localhost.localdomain systemd[1]: Stopped TDengine server service. 9月 08 14:38:39 localhost.localdomain systemd[1]: start request repeated too quickly for taosd.service 9月 08 14:38:39 localhost.localdomain systemd[1]: Failed to start TDengine server service. 9月 08 14:38:39 localhost.localdomain systemd[1]: Unit taosd.service entered failed state. 9月 08 14:38:39 localhost.localdomain systemd[1]: taosd.service failed.  

那么执行/usr/bin/taosd错误如下：

09/08 15:09:14.406291 00046820 UTL fail to load apoll url 09/08 15:09:14.406415 00046820 UTL load from cfg file /etc/taos/taos.cfg success 09/08 15:09:14.406439 00046820 UTL failed to load env file: .env 09/08 15:09:14.406452 00046820 UTL load from env variables cfg success 09/08 15:09:14.407276 00046820 UTL fail to load apoll url 09/08 15:09:14.407385 00046820 UTL load from cfg file /etc/taos/taos.cfg success 09/08 15:09:14.407435 00046820 UTL failed to load env file: .env 09/08 15:09:14.407453 00046820 UTL load from env variables cfg success 09/08 15:09:14.407647 00046820 UTL                      global config 09/08 15:09:14.407662 00046820 UTL ================================================================= 09/08 15:09:14.407674 00046820 UTL default      firstEp                  localhost:6030 09/08 15:09:14.407685 00046820 UTL default      secondEp                 localhost:6030 09/08 15:09:14.407695 00046820 UTL default      fqdn                     localhost 09/08 15:09:14.407708 00046820 UTL default      serverPort               6030 09/08 15:09:14.407719 00046820 UTL default      tempDir                  /tmp 09/08 15:09:14.407730 00046820 UTL default      minimalTmpDirGB          1.00 09/08 15:09:14.407758 00046820 UTL default      shellActivityTimer       3 09/08 15:09:14.407766 00046820 UTL default      compressMsgSize          -1 09/08 15:09:14.407773 00046820 UTL default      compressColData          -1 09/08 15:09:14.407781 00046820 UTL default      queryPolicy              1 09/08 15:09:14.407788 00046820 UTL default      querySmaOptimize         0 09/08 15:09:14.407795 00046820 UTL default      queryPlannerTrace        0 09/08 15:09:14.407802 00046820 UTL default      smlChildTableName         09/08 15:09:14.407808 00046820 UTL default      smlTagName               _tag_null 09/08 15:09:14.407815 00046820 UTL default      smlDataFormat            1 09/08 15:09:14.407822 00046820 UTL default      numOfTaskQueueThreads    4 09/08 15:09:14.407829 00046820 UTL cfg_file     dataDir                  /opt/data/taos/data 09/08 15:09:14.407837 00046820 UTL default      minimalDataDirGB         2.00 09/08 15:09:14.407850 00046820 UTL default      supportVnodes            16 09/08 15:09:14.407861 00046820 UTL default      maxShellConns            50000 09/08 15:09:14.407872 00046820 UTL default      statusInterval           1 09/08 15:09:14.407882 00046820 UTL default      minSlidingTime           10 09/08 15:09:14.407893 00046820 UTL default      minIntervalTime          1 09/08 15:09:14.407903 00046820 UTL default      maxNumOfDistinctRes      10000000 09/08 15:09:14.407913 00046820 UTL default      countAlwaysReturnValue   1 09/08 15:09:14.407924 00046820 UTL default      queryBufferSize          -1 09/08 15:09:14.407934 00046820 UTL default      printAuth                0 09/08 15:09:14.407945 00046820 UTL default      multiProcess             0 09/08 15:09:14.407955 00046820 UTL default      mnodeShmSize             20972544 09/08 15:09:14.407965 00046820 UTL default      vnodeShmSize             104858624 09/08 15:09:14.407976 00046820 UTL default      qnodeShmSize             41944064 09/08 15:09:14.407986 00046820 UTL default      snodeShmSize             41944064 09/08 15:09:14.407996 00046820 UTL default      bnodeShmSize             41944064 09/08 15:09:14.408008 00046820 UTL default      numOfShmThreads          1 09/08 15:09:14.408019 00046820 UTL default      numOfRpcThreads          4 09/08 15:09:14.408030 00046820 UTL default      numOfCommitThreads       4 09/08 15:09:14.408041 00046820 UTL default      numOfMnodeReadThreads    1 09/08 15:09:14.408052 00046820 UTL default      numOfVnodeQueryThreads   16 09/08 15:09:14.408064 00046820 UTL default      numOfVnodeStreamThreads  4 09/08 15:09:14.408074 00046820 UTL default      numOfVnodeFetchThreads   4 09/08 15:09:14.408085 00046820 UTL default      numOfVnodeWriteThreads   8 09/08 15:09:14.408096 00046820 UTL default      numOfVnodeSyncThreads    16 09/08 15:09:14.408106 00046820 UTL default      numOfVnodeRsmaThreads    8 09/08 15:09:14.408117 00046820 UTL default      numOfQnodeQueryThreads   16 09/08 15:09:14.408128 00046820 UTL default      numOfQnodeFetchThreads   4 09/08 15:09:14.408138 00046820 UTL default      numOfSnodeSharedThreads  2 09/08 15:09:14.408149 00046820 UTL default      numOfSnodeUniqueThreads  2 09/08 15:09:14.408161 00046820 UTL default      rpcQueueMemoryAllowed    1664782745 09/08 15:09:14.408174 00046820 UTL default      monitor                  1 09/08 15:09:14.408186 00046820 UTL default      monitorInterval          30 09/08 15:09:14.408197 00046820 UTL default      monitorFqdn               09/08 15:09:14.408208 00046820 UTL default      monitorPort              6043 09/08 15:09:14.408219 00046820 UTL default      monitorMaxLogs           100 09/08 15:09:14.408231 00046820 UTL default      monitorComp              0 09/08 15:09:14.408243 00046820 UTL default      telemetryReporting       1 09/08 15:09:14.408253 00046820 UTL default      telemetryInterval        43200 09/08 15:09:14.408265 00046820 UTL default      telemetryServer          telemetry.taosdata.com 09/08 15:09:14.408275 00046820 UTL default      telemetryPort            80 09/08 15:09:14.408286 00046820 UTL default      transPullupInterval      2 09/08 15:09:14.408298 00046820 UTL default      mqRebalanceInterval      2 09/08 15:09:14.408309 00046820 UTL default      ttlUnit                  86400 09/08 15:09:14.408319 00046820 UTL default      ttlPushInterval          86400 09/08 15:09:14.408331 00046820 UTL default      uptimeInterval           300 09/08 15:09:14.408342 00046820 UTL default      udf                      1 09/08 15:09:14.408353 00046820 UTL default      configDir                /etc/taos 09/08 15:09:14.408364 00046820 UTL default      scriptDir                /etc/taos 09/08 15:09:14.408375 00046820 UTL cfg_file     logDir                   /opt/data/taos/log/ 09/08 15:09:14.408387 00046820 UTL default      minimalLogDirGB          1.00 09/08 15:09:14.408400 00046820 UTL default      numOfLogLines            10000000 09/08 15:09:14.408411 00046820 UTL default      asyncLog                 1 09/08 15:09:14.408422 00046820 UTL default      logKeepDays              0 09/08 15:09:14.408434 00046820 UTL default      debugFlag                0 09/08 15:09:14.408444 00046820 UTL default      simDebugFlag             143 09/08 15:09:14.408455 00046820 UTL default      tmrDebugFlag             131 09/08 15:09:14.408467 00046820 UTL default      uDebugFlag               131 09/08 15:09:14.408478 00046820 UTL default      rpcDebugFlag             131 09/08 15:09:14.408489 00046820 UTL default      jniDebugFlag             131 09/08 15:09:14.408500 00046820 UTL default      qDebugFlag               131 09/08 15:09:14.408512 00046820 UTL default      cDebugFlag               131 09/08 15:09:14.408523 00046820 UTL default      dDebugFlag               135 09/08 15:09:14.408547 00046820 UTL default      vDebugFlag               135 09/08 15:09:14.408561 00046820 UTL default      mDebugFlag               135 09/08 15:09:14.408610 00046820 UTL default      wDebugFlag               135 09/08 15:09:14.408627 00046820 UTL default      sDebugFlag               135 09/08 15:09:14.408640 00046820 UTL default      tsdbDebugFlag            131 09/08 15:09:14.408651 00046820 UTL default      tqDebugFlag              135 09/08 15:09:14.408662 00046820 UTL default      fsDebugFlag              135 09/08 15:09:14.408674 00046820 UTL default      udfDebugFlag             135 09/08 15:09:14.408685 00046820 UTL default      smaDebugFlag             131 09/08 15:09:14.408696 00046820 UTL default      idxDebugFlag             135 09/08 15:09:14.408707 00046820 UTL default      tdbDebugFlag             131 09/08 15:09:14.408719 00046820 UTL default      metaDebugFlag            135 09/08 15:09:14.408730 00046820 UTL default      timezone                 Asia/Shanghai (CST, +0800) 09/08 15:09:14.408742 00046820 UTL default      locale                   zh_CN.UTF-8 09/08 15:09:14.408753 00046820 UTL default      charset                  UTF-8 09/08 15:09:14.408764 00046820 UTL default      enableCoreFile           1 09/08 15:09:14.408775 00046820 UTL default      numOfCores               8.00 09/08 15:09:14.408789 00046820 UTL default      openMax                  1024 09/08 15:09:14.408801 00046820 UTL default      streamMax                16 09/08 15:09:14.408813 00046820 UTL default      pageSizeKB               4 09/08 15:09:14.408824 00046820 UTL default      totalMemoryKB            16257644 09/08 15:09:14.408835 00046820 UTL default      os sysname               Linux 09/08 15:09:14.408846 00046820 UTL default      os nodename              localhost.localdomain 09/08 15:09:14.408858 00046820 UTL default      os release               3.10.0-957.el7.x86_64 09/08 15:09:14.408869 00046820 UTL default      os version               #1 SMP Thu Nov 8 23:39:32 UTC 2018 09/08 15:09:14.408880 00046820 UTL default      os machine               x86_64 09/08 15:09:14.408892 00046820 UTL default      version                  3.0.1.0 09/08 15:09:14.408903 00046820 UTL default      compatible_version       3.0.0.0 09/08 15:09:14.408914 00046820 UTL default      gitinfo                  6a862b71990bdcceece800061138bcf58f4e37d7 09/08 15:09:14.408926 00046820 UTL default      buildinfo                Built at 2022-09-07 11:55 09/08 15:09:14.408936 00046820 UTL ================================================================= 09/08 15:09:14.412693 00046820 DND start to init dnode env 09/08 15:09:14.412746 00046820 DND ERROR free disk size: 0.752548 GB, too little, require 2.000000 GB at least at least , quit 09/08 15:09:14.412876 00046820 DND ERROR failed to init dnode since No available disk 得出结论：空间不够