目前redis 的fdw有好幾個，github 上有一個start 比較高的，但是對於新版本pg 支持不好，目前使用了
https://github.com/nahanni/rw_redis_fdw，以下是docker 鏡像的構建以及試用
dockerfile
老樣子基於base 鏡像構建
FROM dalongrong/pgspider:base as build
WORKDIR /app
RUN apt-get update && apt-get install -y libhiredis-dev
RUN wget https://github.com/nahanni/rw_redis_fdw/archive/v1.0.tar.gz && tar zxf v1.0.tar.gz && mv rw_redis_fdw-1.0 redis_fdw && cp -rf redis_fdw /app/postgresql-11.6/contrib/redis_fdw
RUN cd /app/postgresql-11.6/contrib/redis_fdw && make && make install
FROM debian:stretch-slim
ENV GOSU_VERSION 1.11
RUN apt-get update && apt-get install -y wget libhiredis-dev libreadline-dev
# explicitly set user/group IDs
RUN set -eux; \
groupadd -r postgres --gid=999; \
# https://salsa.debian.org/postgresql/postgresql-common/blob/997d842ee744687d99a2b2d95c1083a2615c79e8/debian/postgresql-common.postinst#L32-35
useradd -r -g postgres --uid=999 --home-dir=/var/lib/postgresql --shell=/bin/bash postgres; \
# also create the postgres user's home directory with appropriate permissions
# see https://github.com/docker-library/postgres/issues/274
mkdir -p /var/lib/postgresql; \
chown -R postgres:postgres /var/lib/postgresql
RUN wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$(dpkg --print-architecture)" \
&& chmod +x /usr/local/bin/gosu \
&& gosu nobody true
# make the "en_US.UTF-8" locale so postgres will be utf-8 enabled by default
RUN set -eux; \
if [ -f /etc/dpkg/dpkg.cfg.d/docker ]; then \
# if this file exists, we're likely in "debian:xxx-slim", and locales are thus being excluded so we need to remove that exclusion (since we need locales)
grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
sed -ri '/\/usr\/share\/locale/d' /etc/dpkg/dpkg.cfg.d/docker; \
! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
fi; \
apt-get update; apt-get install -y locales; rm -rf /var/lib/apt/lists/*; \
localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
ENV LANG en_US.utf8
# install "nss_wrapper" in case we need to fake "/etc/passwd" and "/etc/group" (especially for OpenShift)
# https://github.com/docker-library/postgres/issues/359
# https://cwrap.org/nss_wrapper.html
RUN set -eux; \
apt-get update; \
apt-get install -y --no-install-recommends libnss-wrapper; \
rm -rf /var/lib/apt/lists/*
RUN mkdir /docker-entrypoint-initdb.d
COPY --from=build /usr/local/pgspider /usr/local/pgspider
RUN sed -ri "s!^#?(listen_addresses)\s*=\s*\S+.*!\1 = '*'!" /usr/local/pgspider/share/postgresql/postgresql.conf.sample; \
grep -F "listen_addresses = '*'" /usr/local/pgspider/share/postgresql/postgresql.conf.sample
RUN mkdir -p /var/run/postgresql && chown -R postgres:postgres /var/run/postgresql && chmod 2777 /var/run/postgresql
ENV PATH $PATH:/usr/local/pgspider/bin
ENV PGDATA /var/lib/postgresql/data
RUN mkdir -p "$PGDATA" && chown -R postgres:postgres "$PGDATA" && chmod 777 "$PGDATA"
VOLUME /var/lib/postgresql/data
COPY docker-entrypoint.sh /usr/local/bin/
RUN ln -s usr/local/bin/docker-entrypoint.sh / # backwards compat
ENTRYPOINT ["docker-entrypoint.sh"]
EXPOSE 5432
CMD ["postgres"]
參考使用
- 環境准備
version: "3"
services:
redis:
image: redis
ports:
- "6379:6379"
pg-redis:
image: dalongrong/pgspider:redis
ports:
- "5432:5432"
environment:
- "POSTGRES_PASSWORD:dalong"
- 啟動
docker-compose up -d
- 使用
// 創建擴展
CREATE EXTENSION redis_fdw;
// 創建server
CREATE SERVER redis_server
FOREIGN DATA WRAPPER redis_fdw
OPTIONS (host 'redis', port '6379');
// 創建用戶映射，此demo 填寫隨意的就可以
CREATE USER MAPPING FOR postgres
SERVER redis_server
OPTIONS (password 'demo');
// 創建外部表映射,一個可寫的string 類型
CREATE FOREIGN TABLE rft_str(
key TEXT,
value TEXT,
expiry INT
) SERVER redis_server
OPTIONS (tabletype 'string');
// insert 數據
insert into rft_str values('user_id','dalong',2000);
- 查詢效果
說明
此redis fdw 擴展功能還是比較強的，支持的方法也比較多，當前還沒有ga，但是很不錯
參考資料
https://github.com/nahanni/rw_redis_fdw
https://github.com/redis/hiredis
https://hub.docker.com/repository/docker/dalongrong/pgspider
https://github.com/rongfengliang/pgspider-docker