1、图片访问异常
问题描述
然后重启了tracker、storage和nginx服务，但是发现图片访问不到，直接页面是一片空白，使用curl访问，也是没有任何返回，就卡在那里，只能Ctrl+c退出来：
[root@host10 logs]# curl http://10.0.0.10:8090/groupA/M00/00/00/cErM6luMkf-IbhOWAAhHLHLDXwwAAAABQKwYD8ACEdE376.jpg-m
#没有任何返回，只能Ctrl+c退出来。
[root@host10 logs]#
原因分析
1、查看端口和进程
查看storage和tracker进程，都还在：
[root@host10 ~]# ps -ef|grep storage.conf
root 1126 1 0 14:57 ? 00:00:00 /usr/bin/fdfs_storaged /etc/fdfs/storage.conf restart
root 5139 5071 0 15:13 pts/8 00:00:00 grep --color=auto storage.conf
[root@host10 ~]# ps -ef|grep tracker.conf
root 5149 5071 0 15:13 pts/8 00:00:00 grep --color=auto tracker.conf
root 30168 1 0 14:44 ? 00:00:00 /usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf restart
[root@host10 ~]#
查看tracker、storage的端口，都是起来的，防火墙也打开了相应的端口：
[root@host10 ~]# netstat -tlunp|grep 23000
tcp 0 0 0.0.0.0:23000 0.0.0.0:* LISTEN 1126/fdfs_storaged
[root@host10 ~]# netstat -tlunp|grep 22122
tcp 0 0 0.0.0.0:22122 0.0.0.0:* LISTEN 30168/fdfs_trackerd
然后查看nginx，发现端口也是起来的，但是进程有异常，只有一个master进程：
[root@host10 sbin]# ps -ef|grep nginx
root 744 22962 0 10:37 pts/8 00:00:00 grep --color=auto nginx
root 29076 1 0 10:21 ? 00:00:00 nginx: master process ./nginx #只有一个master进程
[root@host10 sbin]#
2、查看日志
查看nginx日志，在error_log重复报下面几行错误
ngx_http_fastdfs_process_init pid=29077
[2018-09-05 10:21:46] ERROR - file: shared_func.c, line: 960, open file /etc/fdfs/mod_fastdfs.conf fail, errno: 13, error info: Permission denied
[2018-09-05 10:21:46] ERROR - file: /usr/local/fastdfs-nginx-module/src/common.c, line: 155, load conf file "/etc/fdfs/mod_fastdfs.conf" fail, ret code: 13
2018/09/05 10:21:46 [alert] 29076#0: worker process 29077 exited with fatal code 2 and cannot be respawned
# chmod 755 /etc/fdfs
# /usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf restart
# /usr/bin/fdfs_storaged /etc/fdfs/storage.conf restart
# cd /usr/local/nginx/sbin/
# ./nginx -s reload
然后查看nginx的进程，就有worker进程了：
[root@host10 ~]# ps -ef|grep nginx
nobody 363 29076 0 14:55 ? 00:00:00 nginx: worker process #有worker进程了
root 8456 8381 0 15:27 pts/8 00:00:00 grep --color=auto nginx
root 29076 1 0 10:21 ? 00:00:00 nginx: master process ./nginx
[root@host10 ~]#
访问图片，有内容返回了：
[root@host10 logs]# curl http://10.0.0.10:8090/groupA/M00/00/00/cErM6luMkf-IbhOWAAhHLHLDXwwAAAABQKwYD8ACEdE376.jpg-m
fileExtNamejpgfileLength542508fileNameIMG_1171.jpg
[root@host10 logs]#
让测试在新环境上测试了一下，图片能够正常访问了。
2、图片上传异常
问题描述
在测试反馈图片访问可以正常的时候，为了保险，测试了一下图片上传功能，发现上传图片出现问题：
[root@host10 ~]# /usr/bin/fdfs_test /etc/fdfs/client.conf upload /tmp/test/test10.png
This is FastDFS client test program v5.05
Copyright (C) 2008, Happy Fish / YuQing
FastDFS may be copied only under the terms of the GNU General
Public License V3, which may be found in the FastDFS source kit.
Please visit the FastDFS Home Page http://www.csource.org/
for more detail.
[2018-09-05 11:08:23] DEBUG - base_path=/data/dfs/tracker, connect_timeout=30, network_timeout=60, tracker_server_count=1, anti_steal_token=0, anti_steal_secret_key length=0, use_connection_pool=0, g_connection_pool_max_idle_time=3600s, use_storage_id=0, storage server id count: 0
tracker_query_storage_store_list_without_group:
server 1. group_name=, ip_addr=10.0.0.10, port=23000
group_name=groupA, ip_addr=10.0.0.10, port=23000
[2018-09-05 11:08:23] ERROR - file: tracker_proto.c, line: 48, server: 10.0.0.10:23000, response status 17 != 0
storage_upload_by_filename
upload file fail, error no: 17, error info: File exists #这里报File exists，但是换了很多张新图片上传，都报这个错
[root@host10 ~]#
原因分析
查看storaged.log日志，发现在上传文件的同时，日志就会打印出这几行报错信息：
[2018-09-05 11:15:45] ERROR - file: storage_dio.c, line: 885, trunk file: /data/dfs/group1/data/00/00/000001, offset: 299076 already occupied by other file, trunk header info: file_type=-88, alloc_size=-1127393023, file_size=-397478323, crc32=485419875, mtime=-5927312, ext_name(7)=(<\Ñf§r
[2018-09-05 11:15:45] WARNING - file: trunk_mgr/trunk_mem.c, line: 1620, trunk space already be occupied, delete this trunk space, trunk info: store_path_index=0, sub_path_high=0, sub_path_low=0, id=1, offset=299076, size=24885, status=1
这部分文件使用的新环境本身的文件之外，还将/data/dfs/group1/data/00/00/000001文件也替换成了新环境本身原始的000001文件。然后重启tracker、storage、nginx服务，发现上传功能恢复了：
[root@host10 data]# /usr/bin/fdfs_test /etc/fdfs/client.conf upload /tmp/test/test2.png This is FastDFS client test program v5.05
Copyright (C) 2008, Happy Fish / YuQing
FastDFS may be copied only under the terms of the GNU General
Public License V3, which may be found in the FastDFS source kit.
Please visit the FastDFS Home Page http://www.csource.org/
for more detail.
[2018-09-05 15:40:56] DEBUG - base_path=/data/dfs/tracker, connect_timeout=30, network_timeout=60, tracker_server_count=1, anti_steal_token=0, anti_steal_secret_key length=0, use_connection_pool=0, g_connection_pool_max_idle_time=3600s, use_storage_id=0, storage server id count: 0
tracker_query_storage_store_list_without_group:
server 1. group_name=, ip_addr=10.0.0.10, port=23000
group_name=groupA, ip_addr=10.0.0.10, port=23000
storage_upload_by_filename
group_name=groupA, remote_filename=M00/00/00/rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442.png
source ip address: 10.0.0.10
file timestamp=2018-09-05 15:40:56
file size=17697
file crc32=420302403
example file url: http://10.0.0.10:8090/groupA/M00/00/00/rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442.png
storage_upload_slave_by_filename
group_name=groupA, remote_filename=M00/00/00/rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442_big.png
source ip address: 10.0.0.10
file timestamp=2018-09-05 15:40:56
file size=17697
file crc32=420302403
example file url: http://10.0.0.10:8090/groupA/M00/00/00/rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442_big.png
[root@host10 data]#
[root@host10 data]# ll /data/dfs/group1/data/00/00/|grep 5442
-rw-r--r-- 1 root root 17697 Sep 5 15:40 rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442_big.png
-rw-r--r-- 1 root root 49 Sep 5 15:40 rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442_big.png-m
-rw-r--r-- 1 root root 49 Sep 5 15:40 rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442.png-m
[root@host10 data]#
查看该图片，也是可以查看到的了：
[root@host10 data]# curl http://10.0.0.10:8090/groupA/M00/00/00/rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442_big.png-m
ext_namejpgfile_size115120height80width160
[root@host10 data]#
[root@host10 data]#
[root@host10 data]# curl http://10.0.0.10:8090/groupA/M00/00/00/rDN5CluPiIiIV-bEAABFIRkNTkMAAAAAQAGYYsAAEU5442.png-m
ext_namejpgfile_size115120height80width160
[root@host10 data]#
在浏览器访问
也能看到图片：
