support 2c8g docker (#787)

tools/docker/mini/Dockerfile

 FROM oceanbase/centos7:latest
-RUN yum-config-manager --add-repo https://mirrors.aliyun.com/oceanbase/OceanBase.repo && yum install -y ob-deploy obclient ob-sysbench && mkdir /root/pkg && cd /root/pkg && rm -rf /usr/obd/mirror/remote/* && yumdownloader oceanbase-ce oceanbase-ce-libs && obd mirror clone *rpm && obd mirror list local && rm -rf * && yum clean all
+ARG GIT_SOURCE=github
+
+RUN yum-config-manager --add-repo https://mirrors.aliyun.com/oceanbase/OceanBase.repo && yum install -y ob-deploy obclient ob-sysbench wget rpm* cpio make glibc-devel glibc-headers m4 git obclient && mkdir /root/pkg && cd /root/pkg && rm -rf /usr/obd/mirror/remote/* && yumdownloader oceanbase-ce oceanbase-ce-libs && obd mirror clone *rpm && obd mirror list local && rm -rf * && yum clean all
+
+WORKDIR /root/.obd/plugins/oceanbase/3.1.0
+RUN sed -i 's/system_memory = max(4 << 30, system_memory)/system_memory = max(3 << 30, system_memory)/g' generate_config.py || echo 'system_memory changed'
+RUN sed -i 's/if memory_limit < MIN_MEMORY:/if False and (memory_limit < MIN_MEMORY):/g' generate_config.py || echo 'memory_limit changed'
+RUN sed -i '/_start_check(plugin_context, strict_check)/a\    success = True' start_check.py || echo 'check changed'
+
+# clone code
+RUN mkdir -p /root/source \
+    && cd /root/source \
+    && git clone https://${GIT_SOURCE}.com/oceanbase/oceanbase
+
+WORKDIR /root/source/oceanbase
+
+RUN sed -i 's/const int64_t ObRunningModeConfig::MINI_MEM_LOWER = 8L << 30;/const int64_t ObRunningModeConfig::MINI_MEM_LOWER = 4L << 30;/g' deps/oblib/src/lib/ob_running_mode.cpp || echo "ob_running_mode.cpp no need patched"
+RUN sh build.sh debug --init \
+    && sh build.sh --make -j4 \
+    && cd build_debug \
+    && make DESTDIR=. install \
+    && obd mirror create -n oceanbase-ce -V 100.0.0 -p ./usr/local -t test -f
+
 COPY boot /root/boot/
 ENV PATH /root/boot:$PATH
+WORKDIR /root
 CMD _boot

tools/docker/mini/README.md

@@ -6,7 +6,7 @@ You can deploy OceanBase databases by using many methods. But Docker is the easi
 
 Before you deploy obce-mini image, do a check of these:
 
-- Make sure that your machine has at least 2 physical core and 10GB memory.
+- Make sure that your machine has at least 2 physical core and 8GB memory.
 - Your machine has installed these applications:
 
     Application | Recommended version | Documentation

tools/docker/mini/boot/boot-tmp.yaml

 #FROM https://gitee.com/oceanbase/obdeploy/blob/master/example/mini-local-example.yaml
 oceanbase-ce:
+  tags: test
   servers:
     - 127.0.0.1
   global:
@@ -9,8 +10,8 @@ oceanbase-ce:
     rpc_port: @OB_RPC_PORT@ # default: 2882
     zone: zone1
     cluster_id: 1
-    memory_limit: 8G
-    system_memory: 4G
+    memory_limit: 6G
+    system_memory: 3G
     stack_size: 512K
     cpu_count: 16
     cache_wash_threshold: 1G
@@ -25,10 +26,12 @@ oceanbase-ce:
     enable_auto_leader_switch: FALSE
     enable_one_phase_commit: FALSE
     weak_read_version_refresh_interval: 5s
+    balancer_idle_time: 10m
     trace_log_slow_query_watermark: 1s
     large_query_threshold: 1s
     clog_sync_time_warn_threshold: 1s
     syslog_io_bandwidth_limit: 10M
+    _cache_wash_interval: 1m
     enable_sql_audit: FALSE
     enable_perf_event: FALSE
     clog_max_unconfirmed_log_count: 5000

tools/docker/mini/boot/init_tenant-tmp.sql

-CREATE RESOURCE UNIT IF NOT EXISTS @OB_TENANT_NAME@ max_cpu = 9, max_memory = 2684354560, min_memory = 2684354560, max_iops = 10000, min_iops = 1280, max_session_num = 3000, max_disk_size = 5153960755;
+CREATE RESOURCE UNIT IF NOT EXISTS @OB_TENANT_NAME@ max_cpu = 9, max_memory = 2147483648, min_memory = 2147483648, max_iops = 10000, min_iops = 1280, max_session_num = 3000, max_disk_size = 5153960755;
 CREATE RESOURCE POOL IF NOT EXISTS @OB_TENANT_NAME@ UNIT = '@OB_TENANT_NAME@', UNIT_NUM = 1, ZONE_LIST = ('zone1');
 CREATE TENANT IF NOT EXISTS @OB_TENANT_NAME@ charset='utf8mb4', replica_num=1, zone_list=('zone1'), primary_zone='RANDOM', resource_pool_list=('@OB_TENANT_NAME@');