error：taos connect failed, reason: Unexpected generic error in RPC.

[whwqs]

Bug Description
运行服务后，在linux控制台，运行taos报错：
taos connect failed, reason: Unexpected generic error in RPC.

To Reproduce
Steps to reproduce the behavior:

1. linux版本：Linux version 3.10.0-229.el7.x86_64
2. TDengine版本：TDengine-server-2.0.0.1-Linux-x64.rpm
3. 运行taos报错：taos connect failed, reason: Unexpected generic error in RPC.

Expected Behavior
正常运行

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: Linux version 3.10.0-229.el7.x86_64
• Memory, CPU, current Disk Space
• TDengine Version [TDengine-server-2.0.0.1-Linux-x64.rpm]

Additional Context
上传日志给你们
log.zip

[localvar]

您可以查看一下服务器是否配置了 hostname 吗？谢谢

$ hostname

[whwqs]

配置文件在zip文件里有，看了一下，配置好像都是用#号注释了，应该是没有配置hostname

[whwqs]

卸载后重新安装，依然是同样错误，把过程贴上来，看有没有参考价值

[root@redis ~]# rpm -e TDengine
TDengine taosd is running, stopping it...
TDEngine is removed successfully!
warning: file /usr/local/taos/cfg/taos.cfg: remove failed: No such file or direc tory
[root@redis ~]# cd /opt/tdengine
[root@redis tdengine]# dir
TDengine-client TDengine-server-2.0.0.1-Linux-x64.rpm
TDengine-client-2.0.0.1-Linux-x64.tar.gz
[root@redis tdengine]# rpm -iv TDengine-server-2.0.0.1-Linux-x64.rpm
Preparing packages...
TDengine-2.0.0.1-3.x86_64
Start to install TDEngine...
Created symlink from /etc/systemd/system/multi-user.target.wants/taosd.service t o /etc/systemd/system/taosd.service.

Enter FQDN:port (like h1.taosdata.com:6030) of an existing TDengine cluster node to join
OR leave it blank to build one:
To configure TDengine : edit /etc/taos/taos.cfg
To start TDengine : sudo systemctl start taosd
To access TDengine : use taos in shell

TDengine is installed successfully!
[root@redis tdengine]# taos

Welcome to the TDengine shell from Linux, Client Version:2.0.0.1
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.

taos connect failed, reason: Unexpected generic error in RPC.

[root@redis tdengine]# systemctl start taosd
[root@redis tdengine]# taos

Welcome to the TDengine shell from Linux, Client Version:2.0.0.1
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.

taos connect failed, reason: Unexpected generic error in RPC.

[localvar]

请在 操作系统 shell 中执行下

$ hostname

看是否能取到正确的机器名。

[whwqs]

能取到机器名：redis

[whwqs]

刚才用 taos -h localhost 试了下，报错变成了：
taos connect failed, reason: Unable to establish connection.

[whwqs]

今天早上用taos -h localhost ，先是这样：
[root@redis ~]# taos -h localhost

Welcome to the TDengine shell from Linux, Client Version:2.0.0.6
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.

Failed to open file /root/.taos_history 报这个错
taos>

quit后再 taos -h localhost 正常了：
[root@redis ~]# taos -h localhost

Welcome to the TDengine shell from Linux, Client Version:2.0.0.6
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.

taos>

直接taos还是一样的错：
Welcome to the TDengine shell from Linux, Client Version:2.0.0.6
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.

taos connect failed, reason: Unexpected generic error in RPC.

[whwqs]

基本查明原因了，是因为该虚拟机主机名起名为redis，但在 /etc/hosts 文件中未把redis配置进去，导致直接运行taos时不能把redis解析为127.0.0.1
解决方案就是：在 /etc/hosts文件中把redis配置进去，例如：
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 redis

bug的线索其实也挺明显，就在 /var/log/taos/taosdlog.0文件中：
08/14 14:22:07.465621 0x7f3d4c09d740 UTL ERROR failed to get fqdn, code:-2, reason:Name or service not known
08/14 14:22:07.465661 0x7f3d4c09d740 UTL localEp is: :6030
08/14 14:22:07.466083 0x7f3d4c09d740 UTL timezone not configured, set to system default: (ADT, -0300)
08/14 14:22:07.466123 0x7f3d4c09d740 UTL ERROR locale not configured, set to system default:en_US.UTF-8
08/14 14:22:07.466133 0x7f3d4c09d740 UTL WARN charset not configured, set to system default:UTF-8
08/14 14:22:07.466166 0x7f3d4c09d740 UTL taos config & system info:
08/14 14:22:07.466170 0x7f3d4c09d740 UTL ==================================
08/14 14:22:07.466173 0x7f3d4c09d740 UTL firstEp: :6030
08/14 14:22:07.466175 0x7f3d4c09d740 UTL secondEp: :6030
08/14 14:22:07.466178 0x7f3d4c09d740 UTL fqdn:
08/14 14:22:07.466180 0x7f3d4c09d740 UTL serverPort: 6030
fqdn读取出错
大家以后碰到这个问题：直接运行taos，报错：taos connect failed, reason: Unexpected generic error in RPC.
可以尝试如下步骤解决：
1、运行hostname查看主机名
2、看 /etc/hosts文件中是否配置了上面的主机名
3、没有配置，配置好，一般就解决了

[whwqs]

抱歉，用得不熟练，bug关了又开的

[AlvinCage]

我使用 docker tdengine/tdengine：2.0 遇到了同样的问题：
[root@f614b2808614 TDengine-server]# taos
Welcome to the TDengine shell from Linux, Client Version:2.0.1.1
Copyright (c) 2017 by TAOS Data, Inc. All rights reserved.
taos>
taos> create database demo;

DB error: Unexpected generic error in RPC

hostname配置操作如下（taos.cfg 默认）:
[root@f614b2808614 TDengine-server]# hostname
f614b2808614
[root@f614b2808614 TDengine-server]#
[root@f614b2808614 TDengine-server]#
[root@f614b2808614 TDengine-server]# cat /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.3 f614b2808614
[root@f614b2808614 TDengine-server]#