Fargateにてnginxとdjangoの接続がうまくできない。

現在,djangoとnginxで構成されたバックエンドをECSのFargateでデプロイしようとしているのですが、
nginxとdjangoの接続がうまくできずnginxのタスクがstopしてしまいます。
どなたか原因わかる方おりましたら、ご教授いただければと思います。

nginxのタスクのログは下記でした

nginx.confの中

参照したdocker-compose.yml

docker
1version: "3.7"
2services:
3  django:
4    # コンテナ名
5    container_name: django
6    # ビルドするdockerファイルが格納されたディレクトリ
7    build: ./app
8    # 正常起動後に実行するコマンド
9    command: python3 manage.py runserver 0.0.0.0:8000
10    volumes:
11      # マウントするディレクトリ
12      - ./app:/usr/src/app/
13    ports:
14      # ホスト側のポート：コンテナ側のポート
15      - 8000:8000
16    env_file:
17      # 環境変数に設定するファイル
18      - ./app/.env
19  nginx:
20    container_name: nginx
21    build: ./nginx
22    volumes:
23      - ./app/staticfiles:/usr/src/app/static
24    ports:
25      - 8080:80
26    depends_on:
27      - django
28

試したこと
色々調べてたら、fargate内のタスク内でのコンテナ同士のやり取りは、ネットワークにlocalhostを指定することでやりとりできるという記事をみたので、nginx.confのupstream configの中のdjangoの部分をlocalhostに変更して再度試したのですが、起動できませんでした。。。（しかし、nginxのログは消えました）

追記：
タスク定義の内容

json
1{
2  "ipcMode": null,
3  "executionRoleArn": "arn:aws:iam::**************:role/ecsTaskExecutionRole",
4  "containerDefinitions": [
5    {
6      "dnsSearchDomains": null,
7      "environmentFiles": null,
8      "logConfiguration": {
9        "logDriver": "awslogs",
10        "secretOptions": null,
11        "options": {
12          "awslogs-group": "/ecs/******************************",
13          "awslogs-region": "ap-northeast-1",
14          "awslogs-stream-prefix": "ecs"
15        }
16      },
17      "entryPoint": null,
18      "portMappings": [
19        {
20          "hostPort": 8000,
21          "protocol": "tcp",
22          "containerPort": 8000
23        }
24      ],
25      "command": [
26        "python3",
27        "manage.py",
28        "runserver",
29        "0.0.0.0:8000"
30      ],
31      "linuxParameters": null,
32      "cpu": 0,
33      "environment": [],
34      "resourceRequirements": null,
35      "ulimits": null,
36      "dnsServers": null,
37      "mountPoints": [],
38      "workingDirectory": "/usr/src/app/",
39      "secrets": null,
40      "dockerSecurityOptions": null,
41      "memory": null,
42      "memoryReservation": 128,
43      "volumesFrom": [],
44      "stopTimeout": null,
45      "image": "djangoイメージ",
46      "startTimeout": null,
47      "firelensConfiguration": null,
48      "dependsOn": null,
49      "disableNetworking": null,
50      "interactive": null,
51      "healthCheck": {
52        "retries": 10,
53        "command": [
54          "CMD-SHELL",
55          "curl -f http://localhost:8000/"
56        ],
57        "timeout": 60,
58        "interval": 5,
59        "startPeriod": 120
60      },
61      "essential": true,
62      "links": null,
63      "hostname": null,
64      "extraHosts": null,
65      "pseudoTerminal": null,
66      "user": null,
67      "readonlyRootFilesystem": null,
68      "dockerLabels": null,
69      "systemControls": null,
70      "privileged": null,
71      "name": "django"
72    },
73    {
74      "dnsSearchDomains": null,
75      "environmentFiles": null,
76      "logConfiguration": {
77        "logDriver": "awslogs",
78        "secretOptions": null,
79        "options": {
80          "awslogs-group": "/ecs/******************************",
81          "awslogs-region": "ap-northeast-1",
82          "awslogs-stream-prefix": "ecs"
83        }
84      },
85      "entryPoint": [],
86      "portMappings": [
87        {
88          "hostPort": 80,
89          "protocol": "tcp",
90          "containerPort": 80
91        }
92      ],
93      "command": [],
94      "linuxParameters": null,
95      "cpu": 0,
96      "environment": [],
97      "resourceRequirements": null,
98      "ulimits": null,
99      "dnsServers": null,
100      "mountPoints": [],
101      "workingDirectory": null,
102      "secrets": null,
103      "dockerSecurityOptions": null,
104      "memory": null,
105      "memoryReservation": 128,
106      "volumesFrom": [],
107      "stopTimeout": null,
108      "image": "nginxイメージ",
109      "startTimeout": null,
110      "firelensConfiguration": null,
111      "dependsOn": [
112        {
113          "containerName": "django",
114          "condition": "HEALTHY"
115        }
116      ],
117      "disableNetworking": null,
118      "interactive": null,
119      "healthCheck": null,
120      "essential": true,
121      "links": [],
122      "hostname": null,
123      "extraHosts": null,
124      "pseudoTerminal": null,
125      "user": null,
126      "readonlyRootFilesystem": null,
127      "dockerLabels": null,
128      "systemControls": null,
129      "privileged": null,
130      "name": "nginx"
131    }
132  ],
133  "placementConstraints": [],
134  "memory": "512",
135  "taskRoleArn": null,
136  "compatibilities": [
137    "EC2",
138    "FARGATE"
139  ],
140  "taskDefinitionArn": "arn:aws:ecs:******************************",
141  "family": "******************************,
142  "requiresAttributes": [
143    {
144      "targetId": null,
145      "targetType": null,
146      "value": null,
147      "name": "com.amazonaws.ecs.capability.logging-driver.awslogs"
148    },
149    {
150      "targetId": null,
151      "targetType": null,
152      "value": null,
153      "name": "ecs.capability.execution-role-awslogs"
154    },
155    {
156      "targetId": null,
157      "targetType": null,
158      "value": null,
159      "name": "com.amazonaws.ecs.capability.ecr-auth"
160    },
161    {
162      "targetId": null,
163      "targetType": null,
164      "value": null,
165      "name": "com.amazonaws.ecs.capability.docker-remote-api.1.19"
166    },
167    {
168      "targetId": null,
169      "targetType": null,
170      "value": null,
171      "name": "com.amazonaws.ecs.capability.docker-remote-api.1.17"
172    },
173    {
174      "targetId": null,
175      "targetType": null,
176      "value": null,
177      "name": "com.amazonaws.ecs.capability.docker-remote-api.1.21"
178    },
179    {
180      "targetId": null,
181      "targetType": null,
182      "value": null,
183      "name": "ecs.capability.container-health-check"
184    },
185    {
186      "targetId": null,
187      "targetType": null,
188      "value": null,
189      "name": "ecs.capability.container-ordering"
190    },
191    {
192      "targetId": null,
193      "targetType": null,
194      "value": null,
195      "name": "ecs.capability.execution-role-ecr-pull"
196    },
197    {
198      "targetId": null,
199      "targetType": null,
200      "value": null,
201      "name": "com.amazonaws.ecs.capability.docker-remote-api.1.18"
202    },
203    {
204      "targetId": null,
205      "targetType": null,
206      "value": null,
207      "name": "ecs.capability.task-eni"
208    },
209    {
210      "targetId": null,
211      "targetType": null,
212      "value": null,
213      "name": "******************************"
214    }
215  ],
216  "pidMode": null,
217  "requiresCompatibilities": [
218    "FARGATE"
219  ],
220  "networkMode": "awsvpc",
221  "cpu": "256",
222  "revision": 8,
223  "status": "ACTIVE",
224  "inferenceAccelerators": null,
225  "proxyConfiguration": null,
226  "volumes": []
227}