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        前一段时间记录了下如何在centos7中离线安装postgresql，因为工作需要，我不仅要安装postgresql，还需要安装postgis插件，这篇文章记录下postgis插件的安装过程。

1. 安装前的参考

        如下的链接都是官网上的链接，对你安装postgis 应该会有很大的帮助，安装前可以先仔细看看；

1. https://trac.osgeo.org/postgis/wiki/UsersWikiPostgreSQLPostGIS 最新版依赖及下载地址
   
2. https://trac.osgeo.org/postgis/wiki/PostGISObsoleteVersionsMatrix 版本依赖说明
   
3. https://trac.osgeo.org/postgis/wiki/UsersWikiInstall 安装指引
   
4. https://trac.osgeo.org/postgis/wiki
   

2. 我安装的版本

        由于工作需要，我安装的版本与我们线上保持一致，pg安装的是11.11，postgis安装的是2.5，其它详细信息如下：

软件	依赖	版本
postgresql		11.11
postgis		2.5
	godal	2.2.3
	proj	4.8.0
	geos	3.5.1
	json-c	0.10
	protobuf	2.6.1
	protobuf-c	1.2.1
	LibXML2	2.7.7

3.安装依赖

        安装postgis共分成两步，第一步是安装依赖，第二步是安装postgis本身，因为postgis需要的依赖比较多，一个一个安装需要有点儿耐心。
        注意，如下目录需要修改成你自己使用的目录

3.1 安装gdal

tar -zxvf gdal-2.2.3.tar.gz
cd gdal-2.2.3
./configure --prefix=/app/address/postgre/postgis_dep/gdal
make 
make install

3.2 安装proj

tar -zxvf proj-4.8.0.tar.gz
cd proj-4.8.0
./configure --prefix=/app/address/postgre/postgis_dep/proj
make
make install

3.3 安装geos

tar -jxvf geos-3.5.1.tar.bz2
cd geos-3.5.1
./configure --prefix=/app/address/postgre/postgis_dep/geos
make 
make install

3.4 安装 json-c

tar -zxvf json-c-0.10.tar.gz
cd json-c-0.10
./configure --prefix=/app/address/postgre/postgis_dep/json-c
make
make install

3.5 安装protobuf

tar -zxvf protobuf-2.6.1.tar.gz
cd protobuf-2.6.1
./configure --prefix=/app/address/postgre/postgis_dep/protobuf
make
make install

3.6 安装 protobuf-c

tar -zxvf protobuf-c-1.2.1.tar.gz
cd protobuf-c-1.2.1
./configure --prefix=/app/address/postgre/postgis_dep/protobuf-c
make
make install

3.7 安装LibXML2

下载地址 http://xmlsoft.org/sources/
tar -zxvf libxml2-2.7.7.tar.gz
cd libxml2-2.7.7
./configure --prefix=/app/address/postgre/postgis_dep/libxml2
make
make install

3.8 编辑 ld.so.conf

增加如下配置

/app/address/postgre/postgis_dep/geos/lib
/app/address/postgre/postgis_dep/gdal/lib
/app/address/postgre/postgis_dep/proj/lib
/app/address/postgre/postgis_dep/json-c/lib
/app/address/postgre/postgis_dep/protobuf/lib
/app/address/postgre/postgis_dep/protobuf-c/lib
/app/address/postgre/postgis_dep/libxml2/lib执行sudo ldconfig 使生效

3.9 修改环境配置文件

修改 vi ~/.bashrc
增加如下配置

export PKG_CONFIG_PATH=/app/address/postgre/postgis_dep/protobuf/lib/pkgconfigexport LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/app/address/postgre/postgis_dep/geos/lib:/app/address/postgre/postgis_dep/gdal/lib:/app/address/postgre/postgis_dep/proj/lib:/app/address/postgre/postgis_dep/json-c/lib:/app/address/postgre/postgis_dep/protobuf/lib:/app/address/postgre/postgis_dep/protobuf-c/lib:/app/address/postgre/postgis_dep/libxml2/lib

source ~/.bashrc 使生效

4. 安装postgis

4.1 安装postgis

tar -zxvf postgis-2.5.0.tar.gz
cd postgis-2.5.0
./configure --with-geosconfig=/app/address/postgre/postgis_dep/geos/bin/geos-config --with-projdir=/app/address/postgre/postgis_dep/proj --with-gdalconfig=/app/address/postgre/postgis_dep/gdal/bin/gdal-config --with-jsondir=/app/address/postgre/postgis_dep/json-c --with-pgconfig=/app/address/postgre/pginstall/bin//pg_config --with-xml2config=/app/address/postgre/postgis_dep/libxml2/bin/xml2-config
make
make install

4.2 登录数据库，创建扩展

psql postgres
创建扩展
create extension postgis;
create extension postgis_topology;

4.3 测试

select postgis_full_version();

SELECT ST_SetSRID(ST_Point(-87.71,43.741),4326),ST_GeomFromText(‘POINT(-87.71 43.741)’,4326);

5. 错误解决

1. fatal error: json_object_iterator.h: No such file or director
   
   解决：yum install json-c-devel

2. error: #pragma GCC diagnostic not allowed inside functions
   
   使用高版本gcc，4.4.7不行，我用的是4.8版本

6. 参考

1. postgis相关下载

   1. postgis下载 https://postgis.net/2019/03/PostGIS-2.5.2-2.4.7-2.3.9-Released/
   2. geos下载 https://libgeos.org/usage/download/
   3. libxml2 下载 http://xmlsoft.org/sources/

2. postgis安装参考

   1. https://blog.csdn.net/dbdeep/article/details/123643043 postgis 安装
   2. https://blog.csdn.net/weixin_47308871/article/details/122152508
   3. https://blog.csdn.net/dbdeep/article/details/123643043

        当然在安装postgis之前需要安装postgresql，如果你还没有安装，可以参考我另一篇记录: centos7 离线安装postgresql