PHP 7.1 Docker build will not compile with pgsql - docker

Question

I am using the polinux/httpd:centos repo to run Apache and PHP 7.1. The build seems to go ok. There are a few warnings related to keys, but none related to php or pgsql. The build completes successfully, but when I ssh into the container the module is not listed (php -m) and there's no extension config file in php.d.
I verified it is listed in the Dockerfile multiple times.
I can install php71-php-pgsql manually after starting the container, but then I can't restart Apache without restarting the container.
I've tried moving yum install php71-php-pgsql to the end of the Dockerfile as a separate RUN command (in addition to the original), but it reports it has already been installed, yet when I ssh into the container its not listed in the modules and no config, as mentioned above.
When I rebuild a container I stop and remove it, then run build with the no-cache option.
I'm stumped...
The Dockerfile is quite long, but I can post if that would be helpful.
Thanks.
UPDATE: Dockerfile per request...
FROM polinux/httpd:centos
ENV \
NVM_DIR="/usr/local/nvm" \
NODE_VERSION="9.2.0" \
GIT_VERSION="2.15.0" \
PHP_VERSION="71"
ADD mariadb.repo /etc/yum.repos.d/mariadb.repo
RUN \
rpm --rebuilddb && yum clean all && rm -rf /var/cache/yum && \
yum update -y && \
yum install -y \
wget \
patch \
bzip2 \
unzip \
make \
openssh-clients \
git \
MariaDB-client && \
rpm -Uvh http://rpms.remirepo.net/enterprise/remi-release-7.rpm && \
yum install -y \
php${PHP_VERSION}-php \
php${PHP_VERSION}-php-bcmath \
php${PHP_VERSION}-php-cli \
php${PHP_VERSION}-php-common \
php${PHP_VERSION}-php-devel \
php${PHP_VERSION}-php-fpm \
php${PHP_VERSION}-php-gd \
php${PHP_VERSION}-php-gmp \
php${PHP_VERSION}-php-intl \
php${PHP_VERSION}-php-json \
php${PHP_VERSION}-php-mbstring \
php${PHP_VERSION}-php-mcrypt \
php${PHP_VERSION}-php-mysqlnd \
php${PHP_VERSION}-php-pgsql \
php${PHP_VERSION}-php-opcache \
php${PHP_VERSION}-php-pdo \
php${PHP_VERSION}-php-pear \
php${PHP_VERSION}-php-process \
php${PHP_VERSION}-php-pspell \
php${PHP_VERSION}-php-xml \
php${PHP_VERSION}-php-pecl-imagick \
php${PHP_VERSION}-php-pecl-mysql \
php${PHP_VERSION}-php-pecl-uploadprogress \
php${PHP_VERSION}-php-pecl-uuid \
php${PHP_VERSION}-php-pecl-memcache \
php${PHP_VERSION}-php-pecl-memcached \
php${PHP_VERSION}-php-pecl-redis \
php${PHP_VERSION}-php-pecl-zip && \
ln -sfF /opt/remi/php${PHP_VERSION}/enable /etc/profile.d/php${PHP_VERSION}-paths.sh && \
ln -sfF /opt/remi/php${PHP_VERSION}/root/usr/bin/{pear,pecl,phar,php,php-cgi,php-config,phpize} /usr/local/bin/. && \
mv -f /etc/opt/remi/php${PHP_VERSION}/php.ini /etc/php.ini && ln -s /etc/php.ini /etc/opt/remi/php${PHP_VERSION}/php.ini && \
rm -rf /etc/php.d && mv /etc/opt/remi/php${PHP_VERSION}/php.d /etc/. && ln -s /etc/php.d /etc/opt/remi/php${PHP_VERSION}/php.d && \
yum install -y \
ImageMagick \
GraphicsMagick \
gcc \
gcc-c++ \
libffi-devel \
libpng-devel \
zlib-devel && \
yum install -y ruby ruby-devel && \
echo 'gem: --no-document' > /etc/gemrc && \
gem update --system && \
gem install bundler && \
export PROFILE=/etc/profile.d/nvm.sh && touch $PROFILE && \
curl -sSL https://raw.githubusercontent.com/creationix/nvm/v0.31.2/install.sh | bash && \
source $NVM_DIR/nvm.sh && \
nvm install $NODE_VERSION && \
nvm alias default $NODE_VERSION && \
nvm use default && \
npm install -g \
gulp \
grunt-cli \
bower \
browser-sync && \
echo -e "StrictHostKeyChecking no" >> /etc/ssh/ssh_config && \
curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer && \
chown apache /usr/local/bin/composer && composer --version && \
yum clean all && rm -rf /tmp/yum* && \
sed -i 's|SetHandler application/x-httpd-php|SetHandler "proxy:fcgi://127.0.0.1:9000"|g' /etc/httpd/conf.d/php${PHP_VERSION}-php.conf
ADD container-files /
ENV \
NODE_PATH=$NVM_DIR/versions/node/v$NODE_VERSION/lib/node_modules \
PATH=$NVM_DIR/versions/node/v$NODE_VERSION/bin:$PATH
RUN \
mkdir -p /data/tmp/php && \
chmod -R 777 /data/tmp
# Weird issue: For some reason pgsql is not installed above. May be OoO...
Manually installing worked, so adding here at the end.
RUN \
yum install php71-php-pgsql -y

Answer 1

Chalk this up to inexperience...
This turned out to be a problem with how I was referencing images, first when building and then running the instance. I'm still not sure I fully understand, but I think I was running the base container instead of the modified build.
For others that may run into similar problems, the 2 commands that helped me get this working are:
docker build --rm -t local/httpd-php71 .
... and then ...
docker run \
-d \
--name httpd-php71 \
--restart unless-stopped \
--net dockersubnet \
--volume /www:/var/www \
local/httpd-php71
Where 'local/httpd-php71' is my local/custom build. Before I was not using any tag reference in the build command and then I was referencing 'polinux/httpd:centos', the base, in the run command.
Thanks.