解决阿里云服务器验证码乱码问题

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更换服务器,迁移到新版本的Centos7.4.x系列的服务器，发现验证码一直为乱码,基本判断思路基本确定是字体问题,先让开发指定了字体依然不行,查看了下系统字体,应该是调用了阿里云的默认字体导致的。

系统版本：

$ cat /etc/redhat-release 
CentOS Linux release 7.4.1708 (Core) 
$ uname -a
Linux Practice.t4x.org 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 12 22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/redhat-release

CentOS Linux release 7.4.1708 (Core)

$ uname -a

Linux Practice.t4x.org 3.10.0-693.2.2.el7.x86_64 #1 SMP Tue Sep 12 22:26:13 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

解决方法：

$ yum install fontconfig
$ mv /usr/share/fonts/lyx /tmp/
$ fc-cache -fv

$ yum install fontconfig

$ mv /usr/share/fonts/lyx /tmp/

$ fc-cache -fv

详细过程：

$ yum install fontconfig
$ fc-list            
/usr/share/fonts/lyx/eufm10.ttf: eufm10:style=LyX
/usr/share/fonts/lyx/cmsy10.ttf: cmsy10:style=LyX
/usr/share/fonts/lyx/msam10.ttf: msam10:style=LyX
/usr/share/fonts/lyx/cmmi10.ttf: cmmi10:style=LyX
/usr/share/fonts/lyx/wasy10.ttf: wasy10:style=LyX
/usr/share/fonts/lyx/esint10.ttf: esint10:style=LyX
/usr/share/fonts/lyx/rsfs10.ttf: rsfs10:style=LyX
/usr/share/fonts/lyx/stmary10.ttf: stmary10:style=LyX
/usr/share/fonts/lyx/cmex10.ttf: cmex10:style=LyX
/usr/share/fonts/lyx/msbm10.ttf: msbm10:style=LyX
/usr/share/fonts/lyx/cmr10.ttf: cmr10:style=LyX
$ mv /usr/share/fonts/lyx /tmp/
$ fc-cache -fv
/usr/share/fonts: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/X11/fonts/Type1: skipping, no such directory
/usr/share/X11/fonts/TTF: skipping, no such directory
/usr/local/share/fonts: skipping, no such directory
/root/.local/share/fonts: skipping, no such directory
/root/.fonts: skipping, no such directory
/usr/share/fonts: caching, new cache contents: 0 fonts, 0 dirs
/usr/share/X11/fonts/Type1: skipping, no such directory
/usr/share/X11/fonts/TTF: skipping, no such directory
/usr/local/share/fonts: skipping, no such directory
/root/.local/share/fonts: skipping, no such directory
/root/.fonts: skipping, no such directory
/var/cache/fontconfig: cleaning cache directory
/var/cache/fontconfig: invalid cache file: cfde08ab28ad1d91784abb10973575e3-le64.cache-4
/root/.cache/fontconfig: not cleaning non-existent cache directory
/root/.fontconfig: not cleaning non-existent cache directory
fc-cache: succeeded